the selling price of 18 books is equal to the cost price of 21 books.find the gain or loss percent
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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 %
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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Answer:
answer is 16.67%
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