How many litres of water should be added to 25 litres of milk costing 12 per litre so that by selling the mixture at the cost price a profit of 20% is made? (A) 2 litres (B) 5 litres (C) 8 litres (D) 10 litres

25 M is 12/l Cost of 25 M is 25 * 12 = 300 Cost Price is 300, so with Profit of 20 %, Selling Price is 360 (1.2 * 300, Where 1.2 denotes 100 normal and 0.2 profit so, percentage of Water 60/300 = 1/5 = 20% 20% of 25 litre is is 5 litre.