I uplod this question two times and i take 2 different answers? Could any tutor help me with the correct answer?

Thanks in advance for the one who will solve for his effort ??

Question Three (25 p_oints2 Production data for Badr's Bicycle Factory are as follows: Number of workers Bikes assembled per day 3 60 4 72 5 80 Other than wages, Badr has costs of $200 (for parts and so on) for each bike assembled. a) Bikes sell for $40 each. Find the marginal product and the value of the marginal product for each worker (don't forget about Badr's cost of parts). b) Make a table showing Badr's demand curve for labor