Answer:
c. 5
Step-by-step explanation:
L Q MPL (ΔinQ/ΔinL) VMPL
4 52
5 60 8 80
6 66 6 60
7 70 4 40
8 72 2 20
Note: Labour hired per day = L, Total product = Q, Marginal Product of labor=MPL, VMPL =Price*MPL
A firm will maximize the profit by increasing the number of labor as long as VMPL is higher than or equal to the wage rate. In this case, we observe that VMPL ($80)>wage rate ($75) for L=5 but VMPL ($60)<wage rate ($75) for L=6. So, the optimal number of labor to be hired is 5.