For every car she sells, she earns a 500 dollar fee.
1 car = $500
She sells 4 cars, and we need to find out how much she earns in fees.
4 cars = $ ?
We can set up a proportion to find out how much she earns.
![(1)/(500) =(4)/(?)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/vkbxxrfz5lqgjv84ruwc4yib3dkynnt52k.png)
Cross multiply
1*? = 2,000
Amount she earns from fees is $2000