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September 9th, 2010, 05:01 PM  #1  
Member Joined: Sep 2010 Posts: 35 Thanks: 0  Help in solving this question
Can anyone help me here? I tried this for 15 mins and still couldn't get it. Quote:
 
September 9th, 2010, 05:14 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,950 Thanks: 1141 Math Focus: Elementary mathematics and beyond  Re: Help in solving this question
Let x be the original price of the MP3 player. If the price is reduced by 20% of the original cost then the original cost is found by solving x  0.2x = 112 for x. x  0.2x = 112 0.8x = 112 x = 112/0.8 = 140. Now, reduce the original price of $140 by 30%: 140  0.3 * 140 = 140  42 = $98.00 
September 9th, 2010, 05:20 PM  #3 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Help in solving this question
This is how I would approach it. Let x be the original price of the MP3 player, and we are given x  .2x = 112 .8x = 112 x = 112/(.8 ) = 140 Now 30% off of $140 will be .7(140) = $98.00 edit: Sorry Greg...didn't see that you had edited your post. 
September 9th, 2010, 05:24 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,950 Thanks: 1141 Math Focus: Elementary mathematics and beyond  Re: Help in solving this question 
September 9th, 2010, 10:10 PM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,823 Thanks: 2159 
To reprice any item on sale at 80% of its original price to be on sale at 70% of its original price, simply multiply the current sale price by 7/8. $112 × 7/8 = $98 
September 10th, 2010, 06:04 PM  #6 
Member Joined: Sep 2010 Posts: 35 Thanks: 0  Re: Help in solving this question
THX for your help, I forgot about the 80%


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