A student is working part time as a hairdresser to pay college expenses. The student may work

Question:

A student is working part time as a hairdresser to pay college expenses. The student may work no more than 24 hours per week. Haircuts cost $25 and require an average of 20 minutes, and permanents cost $70 and require an average of 1 hour and 10 minutes. How many haircuts andor permanents will yield an optimal revenue? What is the optimal revenue?