A metal container is in the shape of a cuboid with dimensions 3 m × 2 m × 1.5 m. What will be the cost of painting its outer surface at the rate of Rs. 15 per square meter?
Show answer & explanation
Correct answer: B
Explanation
Given:
Length = 3 m
Width = 2 m
Height = 1.5 m
Painting rate = ₹15 per m²
By formula:
Total surface area of the cuboid = 2(lb + bh + hl)
lb = 3 × 2 = 6
bh = 2 × 1.5 = 3
hl = 1.5 × 3 = 4.5
lb + bh + hl = 6 + 3 + 4.5 = 13.5
Total surface area = 2 × 13.5 = 27 m²
Total cost = 27 × 15 = ₹405