The length, breadth and height of a room are 7 m, 4 m and 9 m, respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of ₹7.50 per m2.
Explanation:
Here we need to calculate the total surface area except the floor
∴ Total area painted = Total surface area - Area of floor = 2(7 × 4 + 4 × 9 + 7 × 9) - 7 × 4 = 226 m2
Total Cost of painting = 226 × 7.5 = Rs. 1,695
Hence, option (b).
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