By selling 8 dozen of pencils, a shopkeeper gains the selling

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By selling 8 dozen of pencils, a shopkeeper gains the selling price of a 1 dozen pencils. His gain percent is ?

1. 12.5%
2. 87.5%
3. 14²/₇
4. None of these

Correct Option: C

∵ Gain = (S.P. of 8 dozen ) - (C.P. of 8 dozen )
⇒ (S.P. of 1 dozen) = (S.P. of 8 dozen ) - (C.P. of 8 dozen)
∴ (C.P. of 8 dozen ) = (S.P. of 7 dozen)

Let C.P. of each dozen be Re. 1
⇒ C.P. of 7 dozen = Rs. 7
⇒ S.P. of 7 dozen = Rs. 8

∴ Gain % = (1 / 7 x 100)% = 14²/₇ %