Question

John's monthly paycheck consists of $4,000 plus a 9% commission on all of his sales. During one month, John earned $11,650. What were his sales during that month?

Answer 1

The problem statement tells us ...

... paycheck = 4000 + 0.09×sales

and that the paycheck amount is 11650. Substituting that into the above equation and solving for sales, we have ...

... 11650 = 4000 + 0.09×sales

... 7650 = 0.09×sales . . . . . . . . . . subract 4000

... 7650/0.09 = sales = 85000 . . . divide by 0.09

John's sales during that month were $85,000.