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:

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:
[A]15%
[B]12%
[C]22%
[D]32%

12%
Let the original price be x Rs.
= \frac{80}{100}\times x = \frac{4x}{5}Rs.
SP = \frac{4x}{5}\times \frac{140}{100} = \frac{28x}{25}Rs.
Gain on original price =
\frac{28x}{25} - x = \frac{3x}{25}
\therefore Gain \%= \frac{3x}{\frac{25}{x}\times 100} = 12\%
Hence option [B] is the right answer.

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