Portable Power Inc. buys portable generators for $470 and sells them for $750. They pay a sales commission of 5% of sales revenue to their sales staff. Portable Power Inc. pays $6,000 a month rent for their store, and also pays $1,800 a month to their staff in addition to the commissions. Portable Power Inc. sold 600 generators in June. If Portable Power Inc prepares a contribution margin income statement for the month of June, what would be their operating income? O $304.500 O $137,700 O $450,000 O$153,300