Use the table below to answer questions about a firm's hiring decision. Labor (workers) Output (units) Total Cost ($ 0 $50 1 15 $60 27 $70 3 37 580 45 $90 5 50 $100 What is the total cost when the marginal product of labor is 15? Choose one: O A $70 O B. $10 O C. $90 O D. $100 O E. $50 O F. $60 O G. $30 O H. $80 O L. $40 O J. $20 What is the total variable cost when the marginal product of labor is equal to 10? Choose one: O A $50 O B. $40 O C. $60 O D. $30 D E. $10