Linda’s Autoplex performs oil changes on automobiles, light trucks, and sport utility vehicles. She is a profitmaximizing business owner whose firm operates in a competitive market. The marginal cost of an oil change is $10. The marginal productivity of the last worker that Linda hired was 1.5 oil changes per hour. What is the maximum hourly wage that Linda was willing to pay the last worker hired?
a. $10
b. $15
c. $20
d. $30