Question : The length, breadth, and height of a cuboidal room are given as 80 m, 70 m, and 80 m, respectively. What will be the total cost of painting the four walls of this room, at the rate of 50 paise per square metre?
Option 1: INR 1,20,000
Option 2: INR 28,000
Option 3: INR 48,000
Option 4: INR 12,000
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Correct Answer: INR 12,000
Solution : The length of the cuboidal room = 80 m The breadth of the cuboidal room = 70 m The height of the cuboidal room = 80 m Cost of painting per square metre = 50 paise Area of four walls of cuboid = 2 × (Length + Breadth) × Height = 2 × (80 + 70) × 80 m$^2$ = 2 × 150 × 80 = 24000 m$^2$ Total cost of painting four walls of room = Rs. (24000 × $\frac{50}{100}$) = INR 12,000 Hence, the correct answer is INR 12,000.
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