A door of length 4m and breadth 2m is fitted in a wall. The length of the wall is 10m and breadth is 8m. Find the cost of whitewashing at the rate of Rs 30 per meter square. *
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area of the wall = 4*2= 8 m^2
area of wall = 10*8= 80m^w
area of wall to be painted= 80-8 = 72m^2
cost of painting= total area (in m^2) *cost of painting per m^2
= 72*30 = RS.2160
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