Calculate the missing amounts for each of the following firms: Note: Do not round intermediate calculations. Round "Selling Price" and "Variable Costs Per Unit" to 2 decimal places. Enter any negative amount with a minus sign. Units Sold Selling Price Variable Costs Contribution Per Unit Margin Fixed Costs Operating Income (Loss) Firm A 11,600 $ 23.00 $ 105,700 $ 42,300 Firm B 7,600 19.00 66,800 32,890 Firm C 7.40 4.80 10,200 (5,960) Firm D 5,500 49.00 41,860 50,690