Stanley's Bicycles store buys bicycles on average for $610 and sells them on average for $750. He pays a sales commission of 15% of sales revenue to his sales staff. Stanley pays $1,900 a month rent for his store, and also pays $7,000 a month to his staff in addition to the commissions. Stanley sold 150 bicycles in June. If Stanley prepares a traditional income statement for the month of June, what would be his gross profit? A. $12,100 B. $21,000 C. $112,500 D. $91,500