Question

the cost price of 10 book is the same as selling price of 8 book the profit percentage

Answer 1

$\boxed{\boxed{\boxed{\bold{\red{solution : \longrightarrow}}}}}$

$\bold{Let \: \: the \: \: cost \: \: price \: \: of \: \: each \: \: book}$
$\bold{be \: \: Rs \: x.}$

$\bold{\underline{According \: \: t o \: \: question}}$

$\bold{CP \: \: of \: \: 8 \: \: books = Rs \: \: 8x}$

$\bold{SP \: \: of \: \: 8 \: books = CP \: \: of \: \: 10 \: books = Rs \: \: 10x}$

$\bold{Now\: \: CP = Rs \: \: 8x \: \: }\\\bold{and \: \: SP = Rs \: \: 10x}$

$\bold{Since \: \: SP > CP, \: \: profit}$

$\bold{Profit = Rs \: \: (10x - 8x)} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \bold{= Rs \: \: 2x}$

$\bold{Required \: \: \: profit \: \: \: percentage}$

$\bold{= ( \frac{profit}{CP} \times 100)\% }\\ \\ \bold{= ( \frac{2x}{8x } \times 100)\%} \\ \\ \bold{= 25\% }\: \: \: \bold\green{\boxed{\boxed{Ans}}}$

$\bold\purple{\boxed{\boxed{\boxed{I \: \: hope \: \: it \: \: will \: \: help \: \: you}}}}$