A door of length 2m and breadth 1m is fitted in a wall. The length of the wall is 4.5m and the breadth is 3.6m.Find the cost of whitewashing the wall,if the rate of whitewashing is $16 per square metre
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area of wall= l×b=4.5×3.6=16.2m
area of door=l×b=2×1=1m
remove the area of door from the area of the door= 16.2-2=14.2m
cost of whitewashing=$16per m²
therefore,
total cost of whitewashing=16×14.2=$227.2
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