The internal dimensions of a room are 15 m x 9 x 5 M the measurement of a door in the room are 2 X 1 m find the total cost of painting the four walls of the room if the cost of painting is a 80 permit square
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Solution
Let length = 15m Breadth = 9m Height = 5m
Area of wall excluding door = 15*5 + 9*5 + 15*5 + 9*5 - 2*1 = 240-2=238m Total cost = 80*283 =1904 rupees