a. Assume that only one product is being sold in each of the following four case situations: (Negative amounts should be indicated by a minus sign. Enter your contribution margin answers as per unit dollar values. Enter your answers rounded to the nearest whole number.) Case Units Sold Sales Variable Expenses Contribution Margin Fixed Expenses Net Income (Loss) 1 $ 16,000 $ $ 192,000 135,000 $8 per unit $25 per unit 49,000 46,000 27,000 40% 9,800 12 11,000 (12,000) 4 329,000 $34 per unit 103,000 b. Assume that more than one product is being sold in each of the following four case situations: (Note: Negative amounts should be indicated by a minus sign.) Case Sales Variable Expenses Average Contribution Margin (percentage) 25 Fixed Expenses Net Income (Loss) 1 $ $ 7,000 510,000 370,000 2 259,000 74,000 117,000 3 50 18,000 4 560,000 364,000 (5,000)