Modeling_internet_promo.gif shows a graph of Sales Revenue, Sales Cost, and Margin Percent through 2001 and 2002, if an internet promotion is run. Months appear along the bottom. Two bars appear for each month: a blue one for Sales Revenue, and a yellow one for Sales Cost. A red line shows margin %. Sales Revenue in this graph increases greatly in the three months that the promotion runs. Sales Cost also increases, and Margin % increases from about 18% through the months before the promotion to 36% by December 2002.