A reduction of 10% in the price of oil enables a house wife to obtain 6kgs more for Rs.900, what is the reduced price for kg?	Choose the correct choice from the following answers.
A) 13	B) 15	C) 25	D) 17	E) 19

Rationale: "900 * ( 10 / 100 ) = 90 - - - - 6 ? - - - - 1 = > rs . 15 answer : b"
Answer: B