Suppose Bob has a part-time business washing cars.He has washed nine cars on a given day;the marginal benefit of washing the tenth car is $20 and the marginal cost is $12.Bob should:

A) wash the tenth car.
B) not wash the tenth car.
C) increase his marginal benefit.
D) There is not enough information to decide.

Marginal Benefit

The additional satisfaction or utility that a person receives from consuming an extra unit of a good or service.

Marginal Cost

The cost increase resulting from the production of an extra unit of a product or service.

Part-Time Business

A venture or enterprise operated on a less than full-time basis, often alongside another job or personal commitments.