document.write( "Question 816797: 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. \r
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Algebra.Com's Answer #491720 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "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, 
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document.write( "she can sell two more drives each week. 
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document.write( " a. Express the revenue function in terms of selling price. R=(20+2x)($400-10x)
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document.write( " b. What price will maximize revenue? x = 15   $400 - 150 = $250
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document.write( "   R=(20+2x)($400-10x) = - 20x^2 + 600x + 8000 = -20(x-15)^2 + 4500 + 8000  
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document.write( "                                               = -20(x-15)^2 + $12,500
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