Question

Madison saves 40% of all that she earns for washing cars. So far she has saved $72. How much has she earned in all?

Answer 1

Madison has earned 180 dollars in all.

Explanation:

Let
`x` denotes amount earned by Madison.

Percentage of amount saved by Madison
`=(40)/(100) x`

Amount saved by Madison
`=72` dollars

Therefore,

`(40)/(100)x=72\\x=72((100)/(40))`

`=180` dollars

So,

Madison has earned 180 dollars in all.