To a sugar solution of 3 liters containing 40% sugar, one liter of water is added. The percentage of sugar in the new solution is?  Choose the correct choice from the following
A) 20 %
B) 30 %
C) 25 %
D) 15 %
E) 50 %

Rationale: quantity of sugar = 40 * 3 / 100 = 1.2 kg new percentage = 1.2 / 4 * 100 = 30 % answer is b
Answer: B