A reduction of 40% in the price of oil enables a house wife to obtain 5kgs more for Rs.800, what is the reduced price for kg?
Pick one
A) 80 B) 72 C) 64 D) 56 E) 48

Rationale: "800 * ( 40 / 100 ) = 320 - - - - 5 ? - - - - 1 = > rs . 64 answer : c"
Answer: C