Answer:
1. The marginal revenue product of the 6th unit of labor is $10
2. Hire more workers.
Step-by-step explanation:
1. MRP of 6th unit = TR of 6th unit - TR of 5th unit
TR = PX Q
TR of 6th unit = 5 X 11 = $ 55
TR of 5th unit = 5 X 9 = $ 45
MRP of 6th unit = 55 - 45 = $ 10
2. hire more workers because firm's additional fixed cost is less than firm's marginal revenue. So, it is profitable for firm to increase its production.