The Solo Coal Mine Is the Only Employer in the Small

The Solo Coal Mine is the only employer in the small town of Way out there. The market supply of coal miners is and , where W is the annual wage of a coal miner and Q is the number of coal miners. What is the wage required to hire the profit maximizing number of workers?

A) $25,000
B) $50,000
C) $20,000
D) $15,000