Fill in the missing amounts in each of the four case situations below. Each case is independent of the others. (Hint: One way to find the missing amounts would be to prepare a contribution format income statement for each case, enter the known data, and then compute the missing items.) Case Units Sales Variable Contribution Fixed Net Operating Sold Expenses Margin per Unit Expenses Income A 20,000 $300,000 $220,000 ? $45,000 ? B 12,000 ? $120,000 $15 ? $18,000 Case Sales Variable Expenses ? ? Average Contribution Margin Ratio 40% Fixed Expenses ? $120,000 Net Operating Income $125,000 $37,500 $900,000 ? 45% D Required: 1. Cases A and B assume that only one product is being sold. 2. Cases C and D assume that more than one product is being sold