The cost of painting the four walls of a room is Rs. 350.

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The cost of painting the four walls of a room is Rs. 350. The cost of painting a room three times in length, breadth and height respectively will be ?

1. Rs. 1050
2. Rs. 1400
3. Rs. 3150
4. Rs. 4200

Correct Option: C

Area of 4 walls of the room = [2 (l + b ) x h ]m²
Area of 4 walls of new room = [2 (3l + 3b) x 3h]m²
= 9 x [2(l + b) x h ]m²
∴ Cost of painting the 4 walls of the new room = Rs. (9 x 350)
= Rs. 3150