Question

A bookseller sold $200$ copies of a book at a loss of $5$. If each copy costs him $rs40$, find the selling price of the book.

Answer 1

$N=200$

$CP=40$

$\Rightarrow \left(\frac{SP-SP}{CP}\right)\times 100=5$

$\frac{40-SP}{40}\times 100=5$

$40\times 20-20SP=40$

$800=40=SP$

$760=20SP$

$SP=\frac{760}{20}=38$

$SP=200\times 38$

$=7600$