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when a CD player is proiced at $300 per unit, a store sells [#permalink]
14 Jul 2003, 06:49
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when a CD player is proiced at $300 per unit, a store sells 15 units per week . Each time the price is reduced by $10, however, the sales increase 2units per week. What selling price will result in weekly revenues of $7000 ?
How do you get the equation in 2nd line? I broke my head for ten minutes to slove this equation! Is there is nifty way to solve these kind of Quad equations?
I used thr trial and error method. It landed out to be fastest. As fasr as i know GMAT doesnt involve complex calculations. They are not checking your skills to solve complex quadratic. The want quick and efficient methods to be arrive at the answer.
As some of the math wizards already pointed out , there is no much brain to be used on this question. The answer choices contained were 175 and 200 along with other values. Most of us (including me ) chose 175 ( in 20 secs ) which is clearly wrong !! CD price is decreasing by 10s . If you ask any 1st grader to count by 10, he / she wont find 175..