Question :-
The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows
in the room; each door measures 2.5 m by 1.2 m and each window 1,5 m by 1 m. Find the cost of painting the walls at Rs 3.50 per square metre.
Answers
Answer :
Surface area of the room = 2 (l +b )×h
= 2(12.5+4) ×7
= 2(21.5)×7
= 310m².
Therefore, the surface area of the room = 310m².
Surface area of the 2 doors = 2(l ×b)
= 2 × 2.5×1.2
x =6m².
Surface are of 4 windows = 4 (l×b)
= 4×1.5×1
y = 6.0m².
Total area which needed to be painted
= A (x +y)
= 310 (6+6)
= 289m².
Cost of painting the room = Rate × Area
= Rs.3.50/m² × 289m².
= Rs.1011.50
Hence, the cost of painting the walls at Rs.3.50 per square meter is = Rs.1011.50
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