By selling an article at Rs.600, a profit of 25% is made. Find its cost price?  Choose the correct choice from the following options:
A) 322  B) 480  C) 287  D) 192  E) 107

Rationale: "explanation : sp = 600 cp = ( sp ) * [ 100 / ( 100 + p ) ] = 600 * [ 100 / ( 100 + 25 ) ] = 600 * [ 100 / 125 ] = rs . 480 answer : b"
Answer: B