Question

by selling 90 ball pens for rs180 a person loses 20%.how many ball pens should he sell for Rs 96 so as to have a gain of 20%

Answer 1

sp=180

lose=20%

cp=100/(100-lose%)×sp

cp=100/80×20

cp=225

cost of 1 pen =225÷90=2.5

let x is the no of pens

now 20%of x+x=96

o.5x+x=96

1.5x=96

x=64 ans