Question

the selling price of 18 books equal to the cost price of 21books .find the gain or loss percent​

Answer 1

Answer:

21 CP = 18 sp

CP=18/21sp

CP/SP= 18/21

CP/SP= 6/7

1/6*100

100/6

16.66%

Answer 2

Step-by-step explanation:

Gain%=gain×100/CP

Loss%=loss×100/CP

cost of a book is one rupee

Therefore, selling price of one book is 21/18=7/6=1.167

Gain=7/6−1

⇒Gain=1/6

gain percentage = 1/6 *100= 16.66%