When Burger Barn hires one worker, 10 customers can be served in an hour. When Burger Barn hires two workers, 25 customers can be served in an hour. The marginal product of the second worker is ________ customers served per hour.

A) 15
B) 30
C) 40
D) 67.5

Marginal Product

The extra output generated from increasing a particular input by one unit, while all other inputs remain unchanged.

Customers Served

The number of consumers who purchase or are provided with a product or service by a business within a specific period.