Question

The cost price of 18 notebooks is equal to the selling price of 15 notebooks, find his gain percent.
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Answer 1

answer

Given=

let C.P of 18 notebook = 10

let S.Pof 15 notebook = 10

gain = 10 +10 =20

=20/100 *10

=20% answer

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Answer 2

The gain percent is 20%.

Explanation:

Let the cost price of one notebook be Rs 100.

Then , the  cost price of 18 notebooks = 18 x Rs 100 = Rs 1800

Now , the selling price of 15 notebooks= cost price of 18 notebooks

Therefore , the selling price of 15 notebooks= Rs 1800

⇒ The selling price of one notebooks= (Rs 1800) ÷ 15

=120

Now , gain = Selling price- cost price

i.e. gain = 120-100=20

Gain percent =$\dfrac{gain}{cost\ price}\times100$

$=\dfrac{20}{100}\times100=20\%$

Hence, the gain percent is 20%.

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The cost price of 15 dozen notebooks is equal to the selling price of 12 notebooks .find the gain percent?

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