Carrier Lennox Trane York Sales $ 166,000 $ 870,000 $ 54,000 $ 273,000 Sales discounts 5,000 20,000 600 5,000 Sales returns and allowances 18,000 6,000 5,500 2,000 Cost of goods sold 94,952 537,628 36,883 129,808 (a) Compute net sales, gross profit, and the gross margin ratio for each of the four separate companies. (b) Which company has the better gross margin ratio