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GRE 17- A shopkeeper sells his goods using 20% lesser weight and professes to sell the goods...

A shopkeeper sells his goods using 20% lesser weight and professes to sell the goods at the cost price. How much does he gain from his lie? Indicate the correct option. A shopkeeper sells his goods using 20% lesser weight and professes to sell the goods at the cost price. How much does he gain from his lie? Indicate the correct option. A)5% B)8% C)20% D)25% E)10%