Question

the cost price of 18 notebooks is as the selling price of 16 notebooks find the gain percent
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Answer 1

Answer: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

so the gain% is 20