Question : Rama mixes 20% of kerosene into petrol and then he sells the whole mixture at the price of petrol. If the cost price of the kerosene is 40% of the cost price of petrol. Then what is his net profit %?
Option 1: 11.11%
Option 2: 11.5%
Option 3: 12.5%
Option 4: 9.5%
Correct Answer: 11.11%
Solution :
Cost price (CP) of 1 litre petrol = Rs. 100
CP of 1 litre kerosene is 40% of the CP of petrol = Rs. 40
In 1 litre petrol, quantity of kerosene mixed = 20% of 1000 ml = 200 ml
The price of 1 litre petrol and 200 ml kerosene = Rs. (100 + 8) = Rs. 108
The selling price(SP) of 1200 ml of the mixture of petrol and kerosene = Rs. 120
Profit = Rs. (120 – 108) = Rs. 12
Profit percentage $=\frac{\text{Profit}}{\text{CP}} × 100= \frac{12}{108} × 100= 11.11\%$
Hence, the correct answer is 11.11%.
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