Compute net sales, gross profit, and the gross margin ratio for each separate case a through d.

(a) (b) (c) (d)

Sales $150,000 $550,000 $38,700 $255,700

Sales discounts 5,000 17,500 600 4,800

Sales ret. & allow. 20,000 6,000 5,100 900

Cost of goods sold 79,750 329,589 24,453 126,500