A milkman purchase the milk at Rs. x per litre and sells

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A milkman purchase the milk at Rs. x per litre and sells it at Rs. 2x per litre still he mixes 2 litres water with every 6 litres of pure milk. What is the profit percentage?

1. 116%
2. 166.66%
3. 60%
4. 100%

Correct Option: B

Let the cost price of 1 litre pure milk be Rs. 1, then
for 6 litres (milk) CP = Rs. 6
for 2 litres (Water) CP = Rs. 0

and for 8 litres mixture SP = 8 x 2 = Rs.16

Profit = [(16-6) / 6] x 100 = 1000 / 6 = 166.66 %