To gain 10% on selling sample milk at the cost price of

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To gain 10% on selling sample milk at the cost price of pure milk, the quantity of water to be mixed with 50 kg. of pure milk is

1. 2.5 Kg.
2. 5 Kg.
3. 7.5 Kg.
4. 10 Kg.

Correct Option: B

Let the quantity of water mixed be w kg.
Let the CP of 1 kg of pure milk = $ 1

∴ Gain percent =	w	× 100
	50

⇒ 2w = 10 ⇒ w = 5 kg