Question

By selling 100 pens mohan gains the sp of 40 pens . find s gain percent

Answer 1

let the selling price of each pen be Rupee 1
then by selling pens she made rs.100
now she made a profit of rs.40
so cp of those 100 pens were rs60
or cp of 1 pen be 60 paise
gain =40 paise
percent gain=40/60×100=66.66 percent gain