Finite Mathematics. CHAPTER 6 Finance. Helene Payne Interest. savings account. bond. mortgage loan. auto loan


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1 Finite Mathematics Helene Payne CHAPTER 6 Finance 6.1. Interest savings account bond mortgage loan auto loan Lender Borrower Interest: Fee charged by the lender to the borrower. Principal or Present Value: The amount of money lent or borrowed. Simple Interest: Interest is charged on the principal only. Compound Interest: Interest is charged on both the principal and on previously accumulated interest. 1
2 2 HELENE PAYNE, FINITE MATHEMATICS Exercise 1. Working with Percents. (a) Find 18% of 60. (b) What percent of 80 is 28? (c) 12 is 15% of what number? Exercise 2. If Mrs. Smith borrows $2500 from her friend, Mrs. Fuller. She is to pay back the full amount with 5% simple interest after one year. What is the interest charge? How much should she pay back to Mrs. Fuller? Exercise 3. Sometimes, Bank of America charges as much as 15.9% simple interest on some of its VISA accounts. If your VISA balance at the beginning of the month was $840 on such a card and were assessed interest for that month, giving a new balance of $850.50, what simple interest rate (r) were you charged?
3 Simple Interest Formula. CHAPTER 6. FINANCE 3 P =principal (amount borrowed or lent) r =interest rate per year, as a decimal t =length of loan, in years The simple Interest, I on a deposit (or on a loan) paying simple interest is: (6.1) I = P rt The total accumulated amount A (or future value) in the account (or total amount paid back on a loan) is then: (6.2) A = P + I = P + P rt = P (1 + rt) Exercise 4. Rolf is planning on buying a new car for $ The car dealership is offering two financing plans 6.3% simple interest for five years or 4.2% interest for 3 years. How much would Rolf s monthly payments be under each financing option?
4 4 HELENE PAYNE, FINITE MATHEMATICS Discounted Loans. Interest is deducted from the loan up front. L=amount of loan r =interest rate per year, as a decimal t =length of loan, in years R=proceeds (loan amount minus interest or discount) The proceeds R is given by: (6.3) R = L Lrt = L(1 rt), where Lrt is the discount, the interest deducted from the amount of the loan. Exercise 5. The owner of a restaurant needs to borrow $12, 000 from a bank to buy some equipment. The bank will give the owner a discounted loan at an 11% rate of interest for 9 months. What loan amount should be used so that the owner will receive $12, 000?
5 CHAPTER 6. FINANCE 5 Exercise 6. You need to borrow $5, 000 right now but can repay the loan in 9 months. Since you want to pay as little interest as possible, which type of loan should you take: a discounted loan at 8% per year or a simple interest loan at 8.5% per year? 6.2. Compound Interest For most savings accounts, interest rates are given in terms of compound interest. In the case of compound interest, interest is accumulated both on the original principal and on the already accumulated interest. In other words, you get interest on your interest. Exercise 7. Suppose you deposit $1, 000 in an account paying 5% interest compounded annually (= yearly). (a) How much money will have accumulated in your account after one year: (b) How much will be in your account after two years?
6 6 HELENE PAYNE, FINITE MATHEMATICS The compounding period tells how often interest is accumulated in your account. In the table below we show some common compound (=payment) periods given by financial institutions: Number of Length of Type of Interest Periods Each Interest Interest per Year, m Period Compounded Annually 1 1 year Compounded Semiannually Compounded Quarterly Compounded Monthly Compounded Daily Exercise 8. Connie deposited $1, 000 into her savings account paying 4% interest, compounded quarterly. Fill out the interests and amount in her account in the table below at the end of each quarter. Principal at Interest at Amount at Time, t beginning of end of end of (months) Quarter Quarter Quarter
7 Compound Interest Formula. CHAPTER 6. FINANCE 7 P =principal or present value m=number of interest periods per year t =number of years r =annual interest rate, compounded m times per year, as a decimal i = r = interest rate per period m n =mt = total number of interest periods The future value, A, after t years or mt interest periods is: (6.4) A = P ( 1 + r ) mt = P (1 + i) n m Exercise 9. A principal of $10, 000 was deposited and held in an account for 4 months. Find the amount of the interest and how much money will have accumulated in your account (a) at 14% simple interest (b) at 14% compounded monthly (c) at 14% compounded daily
8 8 HELENE PAYNE, FINITE MATHEMATICS Exercise 10. Ramero plans to buy a new car three years from now. Rather than borrow at that time, he plans to invest part of a small inheritance at 7.5% compounded semiannually to cover the estimated $6, 000 tradein difference. How much does he need to invest if he starts investing now? Exercise 11. How many years will it take for an investment to double if the interest rate is 10% compounded quarterly?
9 CHAPTER 6. FINANCE 9 Exercise 12. The Tanners have received an $28, 000 gift from one of their parents to invest in their child s college education. They estimate that they will need $60, 000 in 12 years to achieve their educational goals for their child. What interest rate compounded semiannually would the Tanners need to achieve this goal? Exercise 13. How many years will be required to turn $10, 000 into $25, 000 if the interest rate is 7.5% compounded monthly? Continuous Compounding. When interest is compounded continuously, the future value of a principal, P is given below: P =principal or present value t =number of years r =annual interest rate The future value, A, after t years is: (6.5) A = P e rt
10 10 HELENE PAYNE, FINITE MATHEMATICS Effective Rate of Interest = Annual Percentage Rate (APR): Effective Rate of Interest of Annual Percentage rate, APR is the percentage by which an account will grow in one year. For simple interest, the APR is the same as the annual percentage rate r, but for compound interest, it is often larger than r. Exercise 14. Find the APR, i.e. the percentage by which a compound interest account paying 3%, compounded monthly, will grow in a year. Exercise 15. Derive a formula for the APR using the compound interest formula, A = P (1 + i) n.
11 CHAPTER 6. FINANCE 11 Effective Rate of Interest = Annual Percentage Rate, APR m=number of interest periods per year r =annual interest rate or the nominal interest rate i = r m = interest rate per period The effective rate of interest or the annual percentage rate, APR is given by: (6.6) AP R = ( 1 + r m) m 1 = (1 + i) m 1 Exercise 16. Which investment earns the most? (a) A certificate of deposit paying 7.25% compounded semiannually. (b) A government bond paying 7.2% compounded quarterly. (c) A savings account paying 7.15% compounded daily.
12 12 HELENE PAYNE, FINITE MATHEMATICS The previous exercise show the power of compounding. The lowest annual interest rates generates the greatest APR, and the highest annual interest rate generates the lowest APR. When comparing different investment options, it is important to compare the APRs, and not the annual interest rates.
13 6.3. Annuites; Sinking Funds CHAPTER 6. FINANCE 13 Annuity: A series of payments made at equally spaced intervals. Ordinary Annuity: A series of fixed payments paid at the end of each interest period. Home Equity: The current market value of a home minus the outstanding mortgage balance. In this class we will only work with ordinary annuities and we will simply call them annuities. Examples of Ordinary Annuities IRA account: a sequence of equal annual payments into an IRA account car loan: a sequence of equal monthly payments to pay off a car loan house loan: a sequence of mortgage payments to pay off a house loan reverse mortgage: a sequence of equal monthly payments from mortgage company to retiree college savings: a sequence of equal monthly payments into a college savings account
14 14 HELENE PAYNE, FINITE MATHEMATICS Assume payments are deposited into an account at the end of each year for 5 years. The account is paying 6% interest compounded annually. Fill out the table below with the accumulated value of each payment at the end of 5 years: Y ears $1, 000 $1, 000 $1, 000 $1, 000 $1, 000 Payment Amount at Number of Years Accumulated Number of Payment at 6% Interest Value 1 $ $ $ $ $1000 The future value or the amount of the annuity, A of the account is then:
15 CHAPTER 6. FINANCE 15 Notice the pattern of the formula: A = p[(1 + i) n 1 + (1 + i) n 2 + (1 + i) n ] This is called a geometric series. It can be shown that the sum can be simplified to: [ (1 + i) n ] 1 A = p i Future Value or Amount of an Annuity p =amount of each payment made at the end of each interest period m=number of interest periods per year t =number of years r =annual interest rate, compounded m times per year, as a decimal i = r = interest rate per period m n =mt = total number of interest periods The future value or amount of the annuity, A, after n interest periods is the sum of all payments and interest earned on those payments: (6.7) A = p (1 + r m )mt 1 r m [ (1 + i) n ] 1 = p i
16 16 HELENE PAYNE, FINITE MATHEMATICS Exercise 17. Catherine decides to put aside $300 every month in a credit union that pays 2% compounded monthly. After making 17 deposits, how much money does Catherine have? Exercise 18. Funding an IRA. (a) To save for retirement, John, at age 40, decides to place $2, 500 into an individual retirement account (IRA) each year for the next 25 years. What will be the value of the IRA when John makes his 25th deposit? Assume that the rate of return of the IRA is 4% per annum compounded annually. (b) If John had begun his IRA at age 30 instead of 40, and made 35 deposits of $2, 500 each, what would his IRA be worth at age 65? Assume a rate of return of 4% per annum compounded annually.
17 CHAPTER 6. FINANCE 17 Exercise 19. Penny plans on putting $1, 000 in an account on her sons birthday, beginning with the first one and continuing through age 18. If the account pays 6% compounded annually, how much should be in the account on Penny s son s 18th birthday? This example show the power of compound interest over a long period. Suppose instead, Penny wanted to have saved up a certain amount by the time her son is 18 years old. How much should she deposit into his account each birthday to achieve the desired future value of his account? Sinking Fund: A fund into which equal payments are made to reach a desired financial goal in the desired length of time. We solve the Ordinary Annuity Formula for p:
18 18 HELENE PAYNE, FINITE MATHEMATICS Payments to a Sinking Fund A=the future value in the desired fund m=number of interest periods per year t =number of years r =annual interest rate, compounded m times per year, as a decimal i = r = interest rate per period m n =mt = total number of interest periods The amount to be deposited at the end of each interest period in order to achieve A, i.e. the Sinking Fund Contribution SF C = p is: r (6.8) SF C = p = A m (1 + r m )mt 1 = A i (1 + i) n 1 Exercise 20. Penny s son will enter college after his 18th birthday. At that time, she would like to have $40, 000 available for college expenses. She is planning on making payments into her son s account on his birthday, beginning with the first one. If the account pays 6% compounded annually, how much should she deposit into her son s account each birthday to achieve her goal?
19 CHAPTER 6. FINANCE 19 Exercise 21. How long does it take to save $100, 000 if you place $300 per month in an account paying 3% compounded monthly? 6.4. Present Value of an Annuity; Amortization The present value of an annuity is the single deposit of P dollars having the same future value after n interest periods as a n payments of p dollars at the end of each compound period. We want to find the value of P in the formula: [ (1 + i) P (1 + i) n n ] 1 = p i divide both sides by (1 + i) n : so [ (1 + i) n ] [ ] 1 1 (1 + i) n P = p = p i(1 + i) n i
20 20 HELENE PAYNE, FINITE MATHEMATICS Present Value of an Ordinary Annuity p =amount of each payment made at the end of each interest period m=number of interest periods per year t =number of years r =annual interest rate, compounded m times per year, as a decimal i = r = interest rate per period m n =mt = total number of interest periods The present value of the annuity is: (6.9) P = p 1 (1 + r m ) n r m [ ] 1 (1 + i) n = p i Exercise 22. Calculate the amount of money required to pay out 10, 000 every 6 months for 10 years at 5% compounded monthly.
21 CHAPTER 6. FINANCE 21 Exercise 23. A student requires $250 each month for the next 10 months to cover miscellaneous expenses at school. A money market fund will pay her interest of 1.5% per annum compounded monthly. How much money should she ask for from her parents now so she can withdraw $250 each month for the next 10 months? Exercise 24. A small business will start paying a $5, 000 franchising fee beginning next year. If a fund earning 8% compounded annually is set aside from which payments will be made, what should be the size of the fund to guarantee annual payments of $5, 000 for the next seven years?
22 22 HELENE PAYNE, FINITE MATHEMATICS Exercise 25. Suppose Bronwyn deposits $100 at the end of each month into an account that pays 5.25% compounded monthly. After three years, she puts the accumulated amount into a certificate of deposit paying 7.5% compounded quarterly for twoandahalf years. After the twoandahalf years are up, she puts the money into a 90day certificate of deposit paying 6.8% annually. When the certificate matures, how much money has Bronwyn accumulated? Consumer Loans Consumer loans (mortgages, auto loans etc) are usually paid back in equal payments at equal time intervals. Therefore, a loan is an annuity. At the end of a time period (month, quarter, year), interest for that period, i, is charged on the unpaid balance of the loan.
23 CHAPTER 6. FINANCE 23 Exercise 26. Suppose you take out a $2, 000 loan at 6% annual interest, which you plan to pay back in 2 years making quarterly payments. For this loan, the monthly payment is $ Fill in the amortization table below, which details how the loan is paid off. We assume that payments are made at the end of each quarter and the interest charged for that quarter is 6%/4 = 1.5% (i = 0.015). Payment # Payment Interest for Applied to Unpaid p Quarter Principal Balance I p I 1 $ $30 $ $1, $ $26.44 $ $1,
24 24 HELENE PAYNE, FINITE MATHEMATICS The last payment will be slightly different from the other payments because of rounding. It is calculated by adding the applied to principal amount to the interest for the quarter. How do we determine the payment amount in the previous example? Suppose the lender could choose between (i) depositing $2, 000 into a savings account paying 6% interest compounded quarterly for 2 years or (ii) lending out the money where the borrower made quarterly payment as in the example above. Suppose that the lender, upon receipt of each payment, immediately deposits them into the account paying 6% interest compounded quarterly for 2 years. The lender is entitled to a payment amount giving the same future value in his account at the end of the 2 years as the single deposit of $2, 000, i.e. [ (1 + i) P (1 + i) n n ] 1 = p i If we solve this for the payment, p, we get the amount of loan payments formula: p = ip 1 (1 + i) n
25 CHAPTER 6. FINANCE 25 Exercise 27. What monthly payment is necessary to pay off a loan of $1, 200 at 8% per annum, (a) In 2 years? (b) In 3 years? (c) What total amount is paid out for each loan? Exercise 28. An appliance dealer advertises a particular brand of refrigerator for $800, which may be financed at 7.9% APR for 48 months. As usual, the payments are to be made in equal monthly installments. Find the approximate amount of each payment.
26 26 HELENE PAYNE, FINITE MATHEMATICS Exercise 29. Pat and Maxine decide to buy a lot on which they plan to build a new house. The lot costs $58, 500, and the bank agrees to finance 80% of the cost at 9% compounded semiannually for a period of three years. Payments on the loan are to be made in equal semiannual installments. (a) Find the amount of each payment. (b) Assuming timely payments, what is the total amount paid for the loan (principal plus interest)?
27 CHAPTER 6. FINANCE 27 Exercise 30. Andy and Brenda have decided to purchase a $350, 000 house, using a down payment of 25%. They can amortize the balance at 4.5% for 20 years. (a) What is their monthly payment? (b) What is the total interest paid? (c) What is their (i) loan balance and (ii) equity after 5 years (assuming the house hasn t appreciated or depreciated in value)? (d) If they pay an additional $100 each month towards the loan, how long will it take them to pay off the loan?
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