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 $6,000 a month rent for the store, and also pays $1,800 a month to staff in addition to the commissions. The company sold 700 generators in June. If the company prepares a contribution margin income statement for the month of June, what would be the contribution margin?