Question

It takes Mike 10 minutes to do an oil change and 20 minutes to do a tire change. He's working for 60 minutes today. He only has enough tires in stock to change them on 2 cars. If he can earn $10 per oil change, and $40 per tire change, how many of each should he do to maximize profits?

Answer 1

2 tire changes and 2 oil changes.

2($40) + 2($10) = $80 + $20 = $100