Discussion
By selling a hard disk for Rs 475, a person loses 5%. To get a gain of 5 %, he should sell the hard disk for
Answer: B
He should sell it for Rs 525.
Selling at Rs 475 means a 5% loss, so Rs 475 is 95% of the cost price:
\[ \begin{aligned} CP &= \frac{475}{0.95} = 500 \\ SP &= 500 \times 1.05 = 525 \end{aligned} \]
Rs 500 is the cost price itself, giving neither gain nor loss. Rs 535 and Rs 575 are gains of 7% and 15% on Rs 500. A common slip is adding 10% to Rs 475, which gives Rs 522.50 and is not an option.
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