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2015-04-15T02:19:20+05:30

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SP  = Rs 5 750
profit =  15 %
SP =  CP + profit % * CP = CP + CP * 15/100 = 115/100 * CP
   CP =  100 * SP / 115 = Rs 5 000

Cost of manufacturing increases,  so CP  becomes  30% more costly.
  CP =  Rs 5 000  + 5000 * 30/100 = Rs 5000 * 130/100
           = Rs 6 500
 
Selling price to the retailer SP  increased by 20%.
  that is  ,  it was Rs 5 750.  now it will be  120/100 *  5 750.  so it will be
    SP  = Rs 6 900

  profit =  SP - CP = 6 900 - 6 500 = Rs 400
   Profit %  =  500 / 6500  * 100  =  100/13 %  =  7.7 %  nearly

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