Question

price of 10 pen is equal to the cost price of 14 pens find the gain percent

Answer 1

let c.p of 1 pen be 1
14cp of pen = 14
but s.p of 10 pen is c.p of 14 pen

so profit= sp-cp=14-10=4

profit %= p/cp×100=4/10×10=40%