18. The dimensions of a room are 9 * 8 * 6.5 metres. It has three windows of 1.5 m x 1m and one door of 2 m x 1.5 m. What will be the cost of white washing the walls and painting the windows and doors, if the rate of white washing is Rs 5 per m² and the rate of painting is Rs. 12 per m²?
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total surface area of the room= 2(lh+lb+hb)m²
2(9*6.5+9*8+8+6.5)m2 =365m²
area of door =l*b
= 2*1.5
= 3m²
area of windows= l*b
= 1.5*1
= 1.5m
therefore surface area of wall=total surface area - area of door- area of window
365 - 3 - 1.5= 360.5m²
best off white washing per metre is rupees =6.40
cost of whitewashing the wall
=6.40* 360.5
=rupees 2307.2
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