G For the period 1983 to 1989, IBM's profit as a percentage of revenue decreased from 13.6% to 6%. In 1991 and 1992, the company made a loss. Microsoft and Intel, on the hand, showed significant increases in their profit as a percentage of revenue. Which one of the following equations would IBM have used to calculate the company's profit or loss? N M 1. Select one: a. Profit/Sales x 100/1 b. Income-cost c. (Price x cost per unit) - units sold d. Price x units sold