Karan purchased one dozen pens for Rs. 120/- and sold a pack

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Karan purchased one dozen pens for Rs. 120/- and sold a pack of 3 pens for Rs. 35/- each. What is his gain?

[RRB NTPC 30 March 2016 - Shift 3]

A 16.67%

B 20%

C 15%

D 33.33%