Question

By selling $100$ mangoes, a fruit seller gains the $C.P$. of $20$ mangoes Find his $gain\%$

Answer 1

SP=selling price

CP=cost price

g=gain

Let SP of each mango be x

SP of $100$ mangoes is $100x$

g=SP of $20$ mangoes $20x$

CP of $100$ mangoes$=SP-g$

$=100x-20x=80x$

$\therefore g.p=\frac{g\times 100}{CP}=\frac{100\times 20}{80}=25$%