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:
Combo Box
A graphical user interface widget that combines a drop-down list or list box and a single-line textbox, allowing users to select an item from a list or enter a new item.
Combo Box Content Control
A user interface element in document design software that combines a text box with a list box, allowing users to select an item from a list or enter a new one.
Content Control Style
Refers to the customization and formatting of placeholders in documents that control the type of content that can be added.
Text Effect
Visual enhancements applied to text, such as shadow, glow, reflection, or 3D appearance.
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