The cost of the paint is rs.20 per kg. if 1kg of paint covers 15 sq.ft, how much will it cost to paint outside of a cube having 5 feet each side Choose the correct choice from the following answers.
A) rs . 200 B) rs . 672 C) rs . 546 D) rs . 876 E) none of these

Rationale: explanation : surface area of a cube = 6 x 5 ^ 2 = 150 sq . ft quantity of paint required = ( 150 / 15 ) = 10 kg cost of painting = 20 x 10 = rs . 200 answer : a
Answer: A