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 cost of the 5th car wash each month?
Definitions:
Effective
In force or operational; commonly refers to the date on which a law, regulation, or agreement is applied or becomes operational.
Secured
Pertaining to a loan or obligation that is backed by collateral to reduce the risk of lending.
Security Interest
A legal claim or liens on property as collateral for the payment of a debt or performance of some other obligation.
Personal Property
Movable assets or belongings, excluding real estate and buildings, owned by an individual or entity.
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