Economics: cost of production Answer asap and shortly. Please do correctly

A. $15.83 18. Refer to the below table. What is the marginal cost when increasing the number of workers from 2 to 3? B. $15.26 C. $13.50 D. $13.27 E. $13.17 Labour Total Marginal |Fixed Variable | Total Marginal Product |Product Costs Costs Cost Cost 0 0 $900 120 SO $900 1 120 900 1600 2500 150 2 270 900 3575 4475 130 3 400 900 5300 6200 100 4 500 900 6650 7550 19. Marginal cost: A. is the total cost of producing each unit of output B. is the change in total cost divided by the change in average product C. falls as long as marginal product continues to rise D. is average product divided by the change in total cost E. is marginal product divided by the change in total cost Refer to the following graph for the next question: MC AC 20. At output level Q, average fixed cost: AVC A. is equal to EF B. is equal to QE Dollars C. is equal to OF C D. is equal to QD E. must be increasing AFC Quantity 21. The relationship between the marginal cost and the average cost schedules is such that: A. the behaviour of one schedule does not affect the other B. if AC exceeds MC, MC must be rising C. if MC is declining, AC may be either declining or rising D. if AC exceeds MC, MC must be declining E. if MC is below AC, AC must be declining