Speedy Supplies sells a product at a price of $100.00. Its variable manufactured cost is $22.00 and the variable marketing cost per unit is $11.50 with fixed cost per period of $50,000. What would be the change in operating income under variable costs if sales increase from 8,000 to 8,500 units? A. $44,250 O B. Loss of $16,750 C. $33,250 D. $39,000