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Question

The dimensions of a room are 14 m × 10 m × 6.5 m. There are two doors and 4 windows in the room. Each door measures 2.5 m × 1.2 m and each window measures 1.5 × 1 m. Find the cost of painting the four walls of the room at Rs 38 per m2.

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Solution

The room has four walls to be painted.

Area of these walls=2(l×h)+2(b×h)=2×14×6.5+2×10×6.5=312 m2

Now,
Area of the two doors = 2×2.5×1.2=6 m2

Area of the four windows = 4×1.5×1=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 38
Cost for painting 300 m2 = 300×38=Rs 11400

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