A reduction of 30% in the price of oil enables a house wife to obtain 9kgs more for Rs.900, what is the reduced price for kg?	Choose the correct choice.
A) 72 B) 27 C) 40 D) 30 E) 20

Rationale: "900 * ( 30 / 100 ) = 270 - - - - 9 ? - - - - 1 = > rs . 30 answer : d"
Answer: D