Suppose the Tasty Taco Company produces tacos. The number of tacos it can produce each hour depends on the number of workers it hires, as shown in the accompanying table. In addition, each taco can be sold for 50 cents more than the cost of the ingredients needed to produce it.

Number of workers per hour	Number of tacosper hour
0	0
1	25
2	45
3	60
4	70
5	75

What is the value of the marginal product of the fourth worker hired each hour?

Select one:

a. $10

b. $70

c. $35

d. $5