A room is 10 metre long and 8 metre wide, it has two window each of 2m × 2m and a door of size 1.5m × 4m . If the cost pf plastering its walls at RS 20 per square meter is RS 3320, find the height of the room.
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If1=5
2=6
3=7
4=8
5=9
6=2
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