Posted by **Andy G** on Wednesday, January 22, 2014 at 8:26pm.

A company that produces portable cassette players estimates that the profit P (in dollars) for selling a particular model is P=-76x^3+4830x^2-320000, 0 is less than or equal to x is less than or equal to 50, where x is the ad expense (in tens of thousands of dollars). using this model, find the smaller of two ad amounts that will yield profit of $800000.

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