Question

a dealer gained 40 percent by selling a pen for rs 21.find the cost price

Answer 1

40x/100=2x/5=gain
S,P=2x/5+x=7x/5
7x/5=21
x=21×5/7
X=15

The cost price is 15

Answer 2

i think answer is 52rs
then pls mark me brainliest answer

so if rs 21=40 percent
then rs 0.52 = 1 percent
then rs 52 = 100 percent
then cost of pen is 52 rs