Q. Krishna bought a camera and paid 20% less than its original price. He sold it at 40% profit on the price he had paid. The percentage of profit earned by Krishna on the original price was
Answer: 12%
Notes: Let the original price be x Rs. $latex = \frac{80}{100}\times x = \frac{4x}{5}Rs. &s=1$ $latex SP = \frac{4x}{5}\times \frac{140}{100} = \frac{28x}{25}Rs.&s=1$ Gain on original price = $latex \frac{28x}{25} - x = \frac{3x}{25}&s=1$ $latex \therefore Gain \%= \frac{3x}{\frac{25}{x}\times 100} = 12\%&s=1$ Hence option [B] is the right answer.

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