a shopkeeper says he sells his goods at cost price ,but he uses a weight of 800 gms instead of 1000 gms .thus makes a gain of ?

• gain=20%
  because of1000-800=200
  gain%=200/1000*100=20% gain at cost price
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• profit=profit/costprice(100)=200/800(100)=200/8
  
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• %gain=(1000-800)*100/1000
  =200*100/1000
  =20%
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• gain % = (error/true-error) *100
  =error(1000-800=200)
  =200/1000-200 *100
  =25%
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• gain%=error/(Actual -error) *100
  
  =200/(1000-200)*100
  
  =25%
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