Power on the Go buys portable generators for $480 and sells them for $740. The company pays a sales commission of 5% of sales revenue to the sales staff. The company pays $3,000 a month rent for the store, and also pays $2,000 a month to staff in addition to the commissions. The company sold 600 generators in June. If the company prepares a contribution margin income statement for the month of June, what would be the contribution margin? A. $156,000 B. $133,800 C. $310,200 D. $444,000