A reduction of 20% in the price of oil enables a house wife to obtain 4kgs more for Rs.684, what is the reduced price for kg? Select the correct option:	A) 72	B) 27	C) 34	D) 28	E) 20

Rationale: "684 * ( 20 / 100 ) = 136 - - - - 4 ? - - - - 1 = > rs . 34 answer : c"
Answer: C