Stanley's Bicycles store buys bicycles on average for $600 and sells them on average for $750. He pays a sales commission of 15% of sales revenue to his sales staff. Stanley pays $1,400 a month rent for his store, and also pays $3,000 a month to his staff in addition to the commissions. Stanley sold 120 bicycles in June. If Stanley prepares a traditional income statement for the month of June, what would be his gross profit?
A) $90,000
B) $18,000
C) $72,000
D) $162,000