Question

the selling price of 12 pen is equal to the cost price of 15 pens find gain or loss percent game

Answer 1

Let selling price of 12 pens is x rupees
Then selling price of one pen will be x/12 rupees.
Cost price of 15 pen is x(as given condition)
Then cost price of one pen will be x/15 rupees.

So gain=x/12-x/15=x/60 rupees.

Percentage gain will be- (x/60)÷(x/15)×100=25%.

So 25% gain for the seller.
He is a good business man.

Thanks.
Tripathy

Answer 2

let the cost price of 15 pens is x
so sp of 12 pens is x
sp of one pen x/12 rs
cp of one pen is x/15 rs
now x/12-x/15 =x/60 rs
so here is a gain
gain percent = [(x/60)/(x/15)]*100=25%