Question

A bookseller sold $$200$$ copies of a book at a loss of $$5%$$. If each copy costs him $$rs 40$$, find the selling price of the book.

Solution

$$N=200$$$$CP=40$$$$\Rightarrow \left(\dfrac{SP-SP}{CP}\right)\times 100=5$$$$\dfrac{40-SP}{40}\times 100=5$$$$40\times 20-20 SP=40$$$$800=40=SP$$$$760=20 SP$$$$SP=\dfrac{760}{20}=38$$$$SP=200\times 38$$$$=7600$$Mathematics

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