a room is 10m long and 8m broad and 7m heigh .it has one door measuring 3m by 2m . find the cost of whote washing the wall at Rs30 per m2
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Answer:
Step-by-step explanation:
LSA of cuboid = 2(lb+bh+hl)
= 2(10×8+8×7+7×10)
= 2(80+56+70)
= 412m2
Area of door = l×b
= 3×2
= 6m2
Area left = area of whole room - area of door
= 412-6
= 406m2
Cost of painting per m2 = 30
= 406×30
= 12180 rupees
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