a classroom is 7 metre long 6 metre broad and 4 metre Hive did doors and windows ago pay and area of 7 metre square find the cost of whites white was linked the wall and roof at the rate of 15 per metre square
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TSA of the room = 2(lb+bh+hl) - area of the floor
=2(lb+bh+hl)−lb
=lb+2(bh+hl)
=lb+2h(l+b)
=7×6+2×4(7+6)
=42+8(13)
=42+104=146m
2
where
l=7m
b=6m
h=4m
cost of white washing per m
2
= Rs 15
cost of white washing 146 m
2
=146×15
= Rs 2,190
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