What is cash and marketable securities as a percent of Credit Sales of Gray Day Computer Co. have if the firm has a current ratio of 2.5 , a quick ratio of 1.2 , and current liabilities of $12,000 ? Gray's credit sales are $98,000, and its average collection period is 40 days? (Assume 365 days per year.) a. 3.9% b. 3.73% c. 3.8% d. 3.5%