The Solo Coal Mine is the only employer in the small town of Way out there. The market supply of coal miners is 09 = 0.02 W 400, where W is the annual wage of a coal miner and dis the number of people who would accept employment as a coal miner. What is the coal mine's marginal expenditure when it hires 100 coal miners? Multiple Choice 0 $20,000 $30,000 0 0 $10,000 0 $35,0 00