Question

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

Answer 1

Answer:

Refer to the attachment.

Step-by-step explanation:

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Answer 2

Answer:

16.67%

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 %

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