Hi,

A retail store can sell 20 hard disk drives per week at a price of $400 each. The manager estimates that for each $10 reduction in price, 

she can sell two more drives each week. 

 a. Express the revenue function in terms of selling price. R=(20+2x)($400-10x)

 b. What price will maximize revenue? x = 15   $400 - 150 = $250

   R=(20+2x)($400-10x) = - 20x^2 + 600x + 8000 = -20(x-15)^2 + 4500 + 8000  

                                               = -20(x-15)^2 + $12,500



 

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