Question

If the cost price of 15pens is equal to the selling price of 20pens , find the loss per cent.

Answer 1

Step-by-step explanation:

Let the cost price and sales price of 1pen be CP and SP respectively

And loss be L

CP of 15 pens=SP of 20 pens

15CP=20SP

SP=CP-L

15CP=20(CP-L)

15CP=20CP-20L

5CP=20L

CP=4L

NOW

L%=L/CP×100

L%=L/4L×100

L%=25%

Hence the loss percent is 20%

Hope it helps,