The FeatureRich Software Company Sells Its Graphing Program, Dogwood, with a Volume

Multiple Choice

The FeatureRich Software Company sells its graphing program, Dogwood, with a volume discount. If a customer buys x copies, then that customer pays $600 \sqrt { x }$ . It costs the company $30,000 to develop the program and $5 to manufacture each copy. If just one customer were to buy all the copies of Dogwood, how many copies would the customer have to buy for FeatureRich Software's average profit per copy to be maximized

A) 2,000 copies
B) 2,500 copies
C) 5,000 copies
D) 10,000 copies
E) 11,000 copies