To solve this, we are going to set up a simple rule of three: If 20% are 48 cars, 100% how many cars will be:
[tex] \frac{20----\ \textgreater \ 48}{100----x} [/tex]
Now, we can express this as a proportion ans solve for [tex]x[/tex]:
[tex] \frac{20}{100} = \frac{48}{x} [/tex]
[tex]x= \frac{(100)(48)}{20} [/tex]
[tex]x=240[/tex]
We can conclude that there are 240 cars in the parking lot.