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A milkman cheats his customer in two ...

A milkman cheats his customer in two ways. He mixes 10% water in pure milk and increases the price of milk by 10%. He purchases 20 kg pure milk at a rate of Rs. 15 per kg. His total profit by selling it is `R s .40` b. `R s .63` c. `R s .80` d. `R s .100`

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