The FeatureRich Software Company sells its graphing program, DogWood, with a volume discount rate. If a customer buys x copies, then he or she pays 400√x . It cost the company $5,000 to develop the program and $2 to manufacture each copy. If a single 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?

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