A reduction of 20% in the price of oil enables a house wife to obtain 5kgs more for Rs.800, what is the reduced price for kg?  Choose the correct choice from the following choices.
A) s . 42  B) s . 46  C) s . 40  D) s . 41  E) s . 32

Rationale: "800 * ( 20 / 100 ) = 160 - - - - 5 ? - - - - 1 = > rs . 32 answer : e"
Answer: E