The total cost of painting the walls and the roof of a hall is to be determined. The hall is 10 meters long, 2.5 meters high, and 4 meters wide. It has a door of dimensions 1.5 meters × 1 meter and two windows of dimensions 1 meter × 0.50 meters each. The cost is given for 12 Rs. square meters of wall area.

Correct option is A

Given:
Cost of colouring the walls and ceiling at 12 per sq. m
Formula Used:
Area of 4 walls = 2 (l+b)h
Solution:
Total area of celling = 10 × 4 = 40 square meter
Area of walls = 2 × 2.5 ( 4+ 10) = 70 square meter
Total area of walls for coloring = 70 - 1.5 × 1 - 2 × (1 × 0.50) = 67.5
Total area for coloring = 67.5 + 40 = 107.5
Total cost of coloring = 107.5 × 12 = 1290