Question

The dimensions of a room are $20 ftxx 15 ftxx 12ft$. Find the cost of painting the walls of the room at rupees 20 per sq. ft.

Answer 1

Correct Answer - ₹ 16800
Length of a room $=20ft$
Breadth of a room $=15ft$
Height of a room $=12ft$
Area of the 4 walls of the room =Lateral surface area of the room $=2(l+b)h$
$=2(20+15)12$
$=24(35)=840sq.ft$
The cost of painting the walls of the room at$ ₹20$ per sq.ft
$=840xx₹ 20 = ₹ 16800$