Question

If the cost price of 6 pencils is equal to the selling price of 5 pencils, find the gain per cent.
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Answer 1

Answer:

As we know that

SP=CP+gain

Given 6 times CP is equal to 5 times SP

⟹6CP=5SP

⟹6CP=5(CP+gain)

⟹6CP=5CP+5gain

⟹CP=5 gain

⟹gain=

5

1

×CP=

100

20

×CP

Gain percent is 20%