a lawn company's standard package of mowing, edging, and trimming costs $20, and the company charges $35 for this service. For total price of $55, the company will also trim shrubs, a service that adds an additional $10 to the cost of the standard package. What is the company's marginal benefit of selling the standard package?

a)$35

b)$20

c)$55

d)$15

Solve with given information.