Question

Terry earned $90 plus 10% of his sales for a net of $159. How much were his sales?

Answer 1

`90+0.1xx y= 159`
`0.10 xx y = 159 - 90`
`0.10 xx y = 69`
`y = 690`

Explanation:

First, we start off by subtracting what he earned from his net earnings.

Then, we divide `69 " by " 0.10` (which is the same as `69 xx 10`),
This gives us his total sales of `$690.`

Answer 2

`$690`

Explanation:

Write it as an equation. 10% of a number is the same as 0.1 multiplied by that number

So

`90+0.1s=159`

Solve the equation for `s`

`0.1s=69`
`s=690`