What is the answer to this? (Use table for both)

QUESTION 38 Number of Workers Output 0 0 1 20 2 45 3 60 4 70 Based on the table above, the marginal product of labor for the second worker is 45 units 22.5 units 25 units 20 units QUESTION 39 Based on the table above, diminishing marginal product of labor begins with the addition of the first worker second worker third worker fourth worker