I have a test and I want the answer within one hour, please

Q5) A grinding/cutting machine and a sprayer are required for wheels and casters , which are made in a huge industry. A wheels takes two hours to grind/cut and three hours to spray, while a caster takes one hour to grind/cut and two hours to spray. The sprayer can run for up to 20 hours per day, while the grinding/cutting system can run for up to 12 hours per day. A wheel is worth $5.00, whereas a caster is worth $3.00. How does the manufacturer plan his regular output to maximize profit, assuming that all of the wheels and casters are sold