Schrute Farm Sales buys portable generators for $480 and sells them for $760. He pays a sales commission of 5% of sales revenue to his sales stafl. Mr. $chrute pays $4,000 a month rent for his store, and also parys $1,900 a month to his staff in addition to the commissions. Mr. Schrute sold 600 generators in June. If Mr. Schrute prepares a contribution margin income statement for the month of June, what would be his contribution margin? A. $456,000 B. $310.800 C. $145,200 D. $766,800