Check Calculate the missing amounts for each of the following firms: (Do not round intermediate calculations.) Sales Variable Costs Fixed Costs Contribution Margin Ratio 32 % Firm A $ 324,000 Operating Income (Loss) $ 37,412 71,599 Firm B 462,000 % Firm C 126,000 116,000 39,300 Firm D 58,000 28 % 24 % (4,905) search a