It costs Homer's Manufacturing $0.95 to produce baseballs and Homer sells them for $9 a piece. Homer pays a sales commission of 5% of sales revenue to his sales staff. Homer also pays $16,000 a month rent for his factory and store, and also pays $76,000 a month to his staff in addition to the commissions. Homer sold 71,500 baseballs in June. If Homer prepares a contribution margin income statement for the month of June, what would be his contribution margin? A. $543,400 B. $575,575 C. $643,500 D. $100,100