The shopkeeper sells 12kg of potatoes for 63rs i.e 1kg for 5.25rs Let cost price = 100x. As he gains 5% the equation can be written as, 105x = 5.25rs (or) 100x = 5rs ∴ Cost price = 5rs He sells 50 kg of the same potatoes for 247.50rs (or) 1kg = 4.95rs Gain or loss percentage = (4.95−
5
5
)(100) = 0.05 x 100 = -1% There will be a loss of 1% Hence, option B is the correct answer.