Question

The total cost to paint all the 4 walls of a room with length, breadth and height as 10 m, 20 m, and 5 m respectively at the rate of Rs. 10 per sq. meter will be:

• A. True
• B. False
• C. 5000
• D. 4000

Answer 1

The correct option is B

False

Given l = 10 cm, b = 20 cm, and h = 5 cm

We know that, lateral surface area of cuboid
= 2h(l + b)
= 2 x 5 x (10 + 20)
= 300 $c{m}^2$

$\therefore$ Total cost of painting the 4 walls
= Area x Rate
= 300 $\times$ 10 = Rs.3000