A book was sold for ₹690, thereby gaining 15%. Find the cost price of the book.

₹595

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₹600

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₹550

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₹512

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Solution

The correct option is B ₹600
Given selling price = ₹690
Gain% = 15%
We know,
Cost price = $\frac{S e l l i n g p r i c e \times 100}{(100 + G a i n %)}$
Therefore,
Cost price = $\frac{690 \times 100}{100 + 15}$

= $\frac{69000}{115}$

= ₹600

Therefore, the cost price of the book is ₹600.

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