Gain or loss. By selling 288 pens, the shopkeeper lost the S. P. of 12
pens. Find his loss
per
cent.

let sp of 1 pen is x rs

sp of 12 pens is 12x rs

so loss by selling 288 pens = 12x rs

now selling price of 288 pens 288x rs

so 12x= cp-sp

or 12x=cp-288x

or cp=300x

now loss percent = (12x/300x)*100=4%

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64