16)Al's Sport Store has sales of $2,980, costs of goods sold of $2,130, inventory of $523, and accounts receivable of $445. How many days, on average, does it take the firm to sell its inventory assuming that all sales are on credit?

15 )The Purple Martin has annual sales of $4,600, total debt of $1,340, total equity of $2,300, and a profit margin of 6 percent. What is the return on assets?

17) Reliable Cars has sales of $3,710, total assets of $3,150, and a profit margin of 5 percent. The firm has a total debt ratio of 41 percent. What is the return on equity?