math word problem helppp??!! :$

Question

Suppose you are starting an office-cleaning business service. You have spent $315 on equipment. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?

Answer 1

So far, you've spent $315 on equipment. Now you use $4 per office, but make $25, so subtract (25-4=21) and you get $21 per office after expenses. So now divide the original $315 by the $21 you make per office cleaning, and you get 15 offices. So it would take 15 offices for you to clean in order to break even