The profit on the sale of a product is 25%.What will be the loss per cent, if the values of cost price and selling price are interchanged?
let CP=100.  PROFIT=25% SO  SP=125.
now interchange CP and SP. Â
CP=125Â Â Â Â SP =100Â
 LOSS=25.
LOSS% = 25/125*100 = 20%Â Â
SHORTCUT METHOD.
25%=1/4 so  CP= 4   SP= 5
 INTERCHANGE
  CP=5   SP=4  so  loss =1/5=20%
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