Suppose 10 workers can produce 140 pounds of peaches and 20 workers can produce 240 pounds of peaches. What is the marginal product of labor from going from 10 to 20 workers?
a. 1 pound of peanuts per worker
b. 2 pounds of peanuts per worker
c. 5 pounds of peanuts per worker
d. 10 pounds of peanuts per worker
e. 12 pounds of peanuts per worker