Х The internal measurements of a cuboidal room are 10 mx 8 mx 4 m. On one of its walls there is a window, the measurement of which is 2 mx 1.5 m. Find the cost of white washing the four walls of the room (leaving the window) at the rate of 55 per sq. m.
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The dimensions of room is 12×8×4
The Lateral surface area is
2h(l+b)
2(4)(12+8)
8×20=160m
Cost of white wash is 5m
Total cost is 5×160=800Rs,
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