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's the average benefit of 4 car washes per month?
Definitions:
Quantity Demanded
The total amount of a good or service that consumers are willing and able to purchase at a given price, in a given time period.
Coffee
A brewed drink prepared from roasted coffee beans, which are the seeds of berries from the Coffea plant.
Price Decreases
Refers to a reduction in the price of goods or services, often due to supply and demand factors.
Price Ceiling
A government-imposed limit on how high a price is charged for a product, intended to protect consumers from high prices.
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