A room is 9 m long, 8 m broad and 6.5 m high. It has one door of dimensions 2 m x 1.5 m and three windows each of dimensions 1.5 mx 1 m. Find the cost of white
washing the walls at Rs 3.80 per square metre.
Answers
L.S.A of room =2h(l+b)
= 2(6.5)[9+8]
= 2(6.5×17)
=110.5×2
=221m^2
area of door = 1.5×2
=3m^2
area of 3windows=3×1.5×1=4.5m^2
area of only walls of room = 221-(3+4.5)
= 221-7.5
=213.5m^2
cost of painting for 1m= Rs.3.80
cost of total painting of wall= 3.8×213.5
= Rs. 811.3
so,cost of painting for only 4 walls of room =Rs.811.3
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