MRP Help Economics Need Details to Solve?

Suppose that a monopoly firm finds that its MR is $50 for the first unit sold each day, $49 for the second unit sold each day, $48 for the third unit sold each day, and so on. Further suppose that the first worker hired produces 5 units per day, the second 4 units per day, the third 3 units per day, and so on. a. What is the firm’s MRP for each of the first five workers?