13. A door of length is 4 m and breadth is 3 m is fited in the wall. The length of the wall is 15.4 m and breadth is 13.6 m. Find the remaining area of the wall. Also, find the cost of whitewashing the wall at the rate of 20 per m².
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door area =4m×3m = 12m^2
area of wall =15.4×13.6 =209.44m^2
remaining area =209.44m^2-12m^2 =197.44m^2
cost of whitewashing=197.44×20=3948.80
m^2 means metre square
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