What is the answer? Kim and Cyndi are starting a business tutoring students in math. They rent an office for $400 per month and charge $40 per hour per student. If they have 15 students each for one hour per week how much profit do they make together in a month?

So

400 is the first cost

profit=x-400

40 per student (each student=1 hour)

x=students, since hour=1

40 times x

profit=40x-400

15 students per week

so

profit per week=40 (15) - 400

profit per week=600-400

profit per week=200

1 month is about 4 weeks so

200 times 4=800

they make 800 a month