fill in the missing amounts in each of the eight case situations below. Each case is independent of the others a. assume that one product is being sold in each of the following four case situations: case 1 Unit sold 15300 sales 183600 variable expenses 122400 fixed expenses 51 000 a. what is the operating income(loss) b. what is the contribution margin per unit case 2: sales 102000 fixed expenses 32 640 operating income (loss) 8160 contribution margin per unit 10 a. what is the # of units sold b. what are the variable expenses. case 3: units sold 10200 variable expenses 71400 operating income (loss) contribution margin per unit 13 a. what are the sales b. what are the fixed expenses case 4: units sold 6120 sales 306000 fixed expenses 102000 operating income (10,200) a. what are the variable expenses b. what is the contribution margin per unit