Question

a classroom is 8 m long , 5 m broad and 3.5 m high . the doors and windows occupy an area of 9 m^2 . what is the cost of painting the walls at a rate of Rs.120 per m^2??
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Answer 1

Answer:

Rs 9840

Step-by-step explanation:

Find the lateral area:

Lateral Area = Perimeter x height

Lateral Area = (8 + 5 + 8 + 5) x 3.5

Lateral Area = 91 m²

Give the area to be painted:

Area of doors and windows = 9 m²

Area to be painted = 91 - 9 = 82 m²

Find the cost:

1 m²  = Rs 120

82 m² = 120 x 82 = Rs 9840

Answer: Rs 9840