If a person sells an article for Rs. 400 gaining 1/4 of its CP , find the gain % ?

Let CP be x 
We are given , Gain = x/4 
Since

Therefore, Gain = 25%

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 Let CP = x

Gain = x/4

SP = CP+Gain

400 = x+x/4 = 5x/4

x = 400*4/5 = 320

So Cost Price = Rs 320

Now Gain% = Gain/CP * 100 = 80/320 * 100 = 25%

So Gain% = 25%

Hope This Helps

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