By selling 100 bananas, fruit seller gains the selling price

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By selling 100 bananas, fruit seller gains the selling price of 20 bananas. His gain per cent is ?

1. 10%
2. 15%
3. 20%
4. 25%

Correct Option: D

∵ Gain = (S.P. of 100 bananas) - (C.P. of 100 bananas)
⇒ (S.P.of 20) = (S.P of 100) - (C.P. of 100)
⇒ S.P.of 80 = C.P. of 100

Let C.P. of each banana = Re. 1
C.P. of 80 banana = Rs. 80
S.P. of 80 banana = Rs. 100

∴ Gain % = (20 / 80) x 100 % = 25%