A store sells 80 MP4 players per week when the players are priced at P = $75. Estimate
Chapter 4, Problem 16(choose chapter or problem)
A store sells 80 MP4 players per week when the players are priced at P = $75. Estimate the number N sold if P is raised to $80, assuming that dN/dP = 4. Estimate N if the price is lowered to $69.
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