Question

Find last year's salary if, after a 6% pay raise, this year's salary is $31,800.

Answer 1

If S is last years salary, we know that this year's salary (after the raise) is calculated by adding 6% of S to S:

`S+S\cdot(6)/(100)=31,800`

We solve here to get last year's salary:

`S(1+0.06)=31,800`
`S=(31,800)/(1.06)=30,000`

Last year's salary was $30,000