Question

By selling 15 pens for the cost price of 18 pens, how much gain or loss percent does a person get?​

Answer 1

Answer:

let the c.p of 1 pen be x

so the c.p of 18 pens will be 18x.

s.p of 15 pens =c.p of 18 pens

s.p of 15 pens = 18x(c.p of 18 pens as shown above)

so the c.p of 15 pens will be 15 x if the c.p of 1 pen is x.

so clearly its a loss.

loss= 18x-15x =3x

loss%= loss/c.p ×100

=3x/15x*100= 20%