Assume that more than one product is being sold in each of the four following case situations: Case Sales Variable Expenses Average Contribution Margin Ratio Fixed Expenses Net Operating Income (Loss) 1 . . . . . . . . . . . . . . . . . . . . . $500,000 ? 20% ? $7,000 2 . . . . . . . . . . . . . . . . . . . . . $400,000 $260,000 ? $100,000 ? 3 . . . . . . . . . . . . . . . . . . . . . ? ? 60% $130,000 $20,000 4