Sunil buys milk at Rs. 6 per litre and adds 1/3rd of water to it and sells mixture at Rs. 7.20 per litre. The gain % of Sunil is

A 40%

B 80%

C 60%

D 25%

E None of these

Correct Answer: Option B

C.P of 1 litre = Rs. 6

After adding water to it, Sunil gets Rs. 7.20 for selling 2/3 liters of milk

So, C.P of 2/3 liters of milk = Rs. 4

profit % = ((7.20 - 4)/4) × 100 = 80%