What is percent change is this from the $3500 per month?

Question

A woman making $3500 per month has her salary reduced by 20% because of sluggish sales. One year later, after a dramatic improvement in sales, she is given a 30% raise over her reduced salary. Find her salary after the raise.

$3640  per month

What percent change is this from the $3500 per month?

_____ %

Answer 1

3500 -20% = (1-.2)(3500) = .8(3500)= 2800

2800+ 30% = 1.3(2800) = 3640

she came out ahead by $140 per month

not as much as 30-20 = 10% might suggest though

It's just a 3640/3500 = 1.04 change = 4% increase over $3500