The cost of the paint is rs.40 per kg. if 1kg of paint covers 20 sq.ft, how much will it cost to paint outside of a cube having 30 feet each side	Choose the correct choice from the following options:
A) rs . 962
B) rs . 672
C) rs . 546
D) rs . 10800
E) none of these

Rationale: "explanation : surface area of a cube = 6 x 30 ^ 2 = 5400 sq . ft quantity of paint required = ( 5400 / 20 ) = 270 kg cost of painting = 40 x 270 = rs . 10800 answer : d"
Answer: D