The table below shows the relationship between the number of times you get your car washed each month and your total monthly benefit from car washes. Each car wash costs $15.  
What is the marginal benefit of the 3^rd car wash each month?

Question

The table below shows the relationship between the number of times you get your car washed each month and your total monthly benefit from car washes. Each car wash costs $15.

 
What is the marginal benefit of the 3^rd car wash each month?

Quizplus · Accepted Answer

Going from 2 to 3 car washes increases total benefit from $36 to $48, so the marginal benefit of the 3^rd car wash is $12.

The Table Below Shows the Relationship Between the Number of Times