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# when a CD player is proiced at $300 per unit, a store sells  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Manager Joined: 25 Jun 2003 Posts: 95 Followers: 1 Kudos [?]: 0 [0], given: 0 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 ? _________________ Brainless Manager Joined: 08 Apr 2003 Posts: 149 Followers: 1 Kudos [?]: 8 [0], given: 0 [#permalink] 14 Jul 2003, 08:18 Selling price will be 200. As 35 units shall be sold then. Intern Joined: 31 May 2003 Posts: 21 Followers: 0 Kudos [?]: 0 [0], given: 0 try to solve this equation [#permalink] 14 Jul 2003, 09:35 (300-a)(15+ 2 (a/10)) = 7000 you will get a=100 or 125, since 125 gives you unbelievably decimaled answer, you know you should choose 100. Then use 300-100=200 SVP Joined: 03 Feb 2003 Posts: 1608 Followers: 6 Kudos [?]: 76 [0], given: 0 [#permalink] 14 Jul 2003, 09:40 (300-10x)(15+2x)=7000 2x^2-45x+250=7000 x=10 Price = 300-10*10=200 Director Joined: 03 Jul 2003 Posts: 655 Followers: 2 Kudos [?]: 22 [0], given: 0 [#permalink] 14 Jul 2003, 13:35 stolyar wrote: (300-10x)(15+2x)=7000 2x^2-45x+250=7000 x=10 Price = 300-10*10=200 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? Manager Joined: 08 Apr 2003 Posts: 149 Followers: 1 Kudos [?]: 8 [0], given: 0 [#permalink] 15 Jul 2003, 02:02 kpadma wrote: stolyar wrote: (300-10x)(15+2x)=7000 2x^2-45x+250=7000 x=10 Price = 300-10*10=200 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. HTH:) Manager Joined: 25 Jun 2003 Posts: 95 Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 15 Jul 2003, 03:54 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.. Well known GMAT trap !! _________________ Brainless [#permalink] 15 Jul 2003, 03:54 Similar topics Replies Last post Similar Topics: A store sells a certain product at a fixed price per unit. 0 29 Dec 2014, 23:47 3 A store sells erasers for 0.23$ per piece and pencil for 0.1 2 26 Jul 2014, 09:36
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