find the cost of digging a 3m wide strip along the border of a rectangular from measuring 30m by 25m at Rs 5per m². find the area of the shaded.
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area of shaded region = area of rectangular field along with boundry - area of rect. field without boandry =30×25 - (30-6)×(25-6) =750 - 456
= 294 sq m
now
cost per sq unit =Rs.5
therefore total cost = 294×5
=Rs.1470 ans
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