Answer:
150
Step-by-step explanation:
The marginal product refers to the additional output generated by using one extra unit of input in the production process:
units of input total output marginal product
1 200 200 (= 200 - 0)
2 350 150 (= 350 - 200)
3 450 100 (= 450 - 350)
4 500 50 (= 500 - 450)