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in Perimeter and Area of Plane Figures by (30.3k points)
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The dimensions of a room are 14 m x 10 m x 6.5 m There are two doors and 4 windows in the room. Each door measures 2.5 m x 1.2 m and each window measures 1.5 m x 1 m. Find the cost of painting the four walls of the room at ₹ 35 per m2.

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The room has four walls to be painted

Area of these walls = 2(l x h) + 2(b x h)

= (2 x 14 x 6.5) + (2 x 10 x 6.5)

= 312m2

Now,

Area of the two doors = (2 x 2.5 x 1.2) = 6 m2

Area of the four windows = (4 x 1.5 x 1) = 6 m2

The walls have to be painted; the doors and windows are not to be painted.

∴ Total area to be painted = 312 - (6 + 6) = 300 m2

Cost for painting 1 m2 = Rs 35

Cost for painting 300 m2 = 300 x 35 = Rs 10,500

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