Answer:
A. 10.
Step-by-step explanation:
Given that
The marginal product of your last worker is 5
The marginal rate of technical substitution between capital and labor is 0.5
So by considering the above information, the marginal product of labor is
= marginal product ÷ marginal rate of technical substitution between capital and labor
= 5 ÷ 0.5
= 10
By dividing the marginal product with the MRTS between labor and capital we can find out the marginal product of capital