A trader mixes 25% kerosene to his petrol and then he sells the whole mixture at the price of petrol. if the cost price of kerosene be 50 % of the cost price of petrol, what is the net profit percentage?

11 1/9 %
12 1/9 %
9 1/11 %
20 %

Correct Answer: 11 1/9 %

Explanation:

K = 1 litre, price of K = 1
P = 4 litre price of P = 2
price of total (new) mixture = 1 X 1 + 4 X 2 = Rs. 9
price of pure petrol of same quantity = 5 X 2 = Rs. 10
Percentage profit = [(10-9) / 9] x 100 = 11¹/₉ %

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