Q. A milkman bought 70 liters of milk for Rs. 630 and added 5 liters of water. If he sells it at Rs. 9.00 per liter, his profit percent is :
Answer: $latex 7\frac{1}{7}$%
Notes: C.P of 75 liters of mixtures of milk and water = Rs. 630. S.P of 75 liters of mixtures of milk and waete = $latex 9\times 75$=Rs. 675. Gain %= $latex \frac{45}{630}\times 100= \frac{50}{7}= 7\frac{1}{7}&s=2$ % Hence option [D] is the right answer.

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