Question

the Sp of 18 books is equal to the CP of 21 books . Find the gain or loss percent
​

Answer 1

Answer:

plz mark as brainly

Step-by-step explanation:

Let the cost price of 21 books be a

Cost price of one book = a/21

Selling price of 18 book = a

=> Selling price of 1 book = a / 18

Gain on one book = SP - CP

= a/18 - a/21

= ( 7a - 6a) / 126

= a / 126.

Now,

Gain % = Gain on 1 book × 100 / CP of 1 book

= ( a / 126) × 100 / ( a / 21)

= 100 × 21 / 126

= 100 / 6

= 16.67 %

Answer 2

Step-by-step explanation:

loss=21-18

=3

loss%=3/21*100

=14. some thing is ur ans.