According to the question, Cost price of 6 litres milk = Rs. 6 Cost price of 2 litres water = Rs. 0 Total cost price of mixture =6x Selling price of 6 litres milk and 2litres water =8×2x⇒16x Profit = Selling price − Cost price ⇒16x−6x=10x Profit percent ={[(SP−CP)∕CP]×100} ⇒(10x∕6x)×100=166.66% ∴ The profit percentage is 166.66%.