A shopkeper cheats to extent of 10% while buying and selling by using false weights.His total percentage gain is.
a)10% b)11%
c)20% c)21%

• let cp of 100 gm goods = Rs 100
  but shopkeeper buys the same 100 gms = Rs 90
  profit in buying for shopkeeper = Rs 10
  and shopkeeper sells the same goods at 10 % gain = (10*100)/90 = Rs 100/9
  hence total profit by shopkeeper = Rs ( 100/9 + 9)= Rs 181/9
  total percentage gain is = ((181/9)/90)*100= 22.23%
• 11 years agoHelpfull: Yes(4) No(2)
• x+y+xy/100 = 21%
• 11 years agoHelpfull: Yes(2) No(0)
• Let the shopkeeper buy a good of 100 gms for Rs x and
  He sells the same good for Rs x but it is of 90 gms
  
  CP of 1 gm = x / 100
  SP of 1 gm = x / 90
  
  gain % = [ (x/90) - (x/100) ] * 100 / (x/100)
  => gain % = 11.11%
  
• 11 years agoHelpfull: Yes(1) No(5)