Question

The dimensions of a hall is 10 m x 9 m x 8 m. Find the cost of white washing the walls and ceiling at the rate of Rs 8.50 per m².

Answer 1

Dimensions of a hall 10m x 9m x 8m 

l = 10 m 

b = 9m 

h = 8 m 

White washing to be done for the area of the surface 

= 2(lh + bh) + lb 

= 2(10 x 8 + 9 x 8) + 10 x 9 

= 2(80 + 72) + 90 = 2 x 152 + 90 

= 304 + 90 = 394 m² 

Cost of white washing per m² = Rs 8.50 

Cost of white washing 394 m² = 394 x 8.50 

Total cost = Rs 3349