A retailer buys a radio for 225 Rs. His overhead expenses are 15 Rs. He sells the radio for 300 Rs. The profit per cent of the retailer is :
[A] $20\%$
[B] $33\frac{1}{3}\%$
[C] $25\%$
[D] $26\frac{2}{3}\%$

This question is part of UPSC Prelims Practice and Mock Tests membership programme.