Solve using 2-step equations. You work as a salesperson at an inside sales job, and earn base
and commission. You earn $400 per month, and 9% commission
on everything you sell. You're living with your parents, so bills this
month will only be $250, but you want to put $2500 into your
savings.
How much do you need to sell at your job to make sure you can
pay your bills and still have enough to save?