Answer:
Jack's gross pay was $2625
Explanation:
Jack pays 20% tax on his gross pay.
After tax, Jack's pay was $2100.
This means "20% subtracted from WHICH NUMBER (gross pay) will give us 2100?"
We can translate this statement into an equation (letting gross pay be
):
![x-(0.2)(x)=2100\\0.8x=2100\\x=(2100)/(0.8)\\x=2625](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4266kj7yidwn9w5qauqf2qqyi23rebv9oa.png)
Hence, Jack's gross pay was $2625.