Luke Limited manufactures widgets. It has established its cost function as y = 3,000 + 16x, where 3,000 is the fixed cost per month, and 16 is the variable cost per widget. In the month of July Luke is planning to manufacture 2,500 widgets. What is the expected variable cost for July? a. 23,000 b. 40,000 C. 43,000 d. 3,000