Find the cost of Painting 3 iron boxes at the rate of rupees 5 per square metre, whose dimensions are 1.5 m × 0.85 m× 0.20 m, 2m × 0.65 m× 0.35 m and 2 m× 0.90 m× 0.45 m.
Answers
Answer:
We know that the area of cobiod
⇒ 2 (lb+bh+hl) where,
l=length of cuboid
b=breadth of cuboid
and, h=height of cuboid
Step-by-step explanation:
Area of box with given dimesions.
⇒1.5m 0.85m and 0.20m
⇒2 (lb+bh+hl)
⇒2(1.5×0.85 + 0.85×0.20 + 0.20×1.5)
⇒2(1.275+0.17+0.3)
⇒6.55 m²
Area of box with dimesions
2m 0.65m and 0.35m
⇒2(2×0.65 + 0.65×0.35 + 0.35×2)
⇒2(1.3+0.2275+0.7)
⇒4.455 m²
Area of box with dimesions
⇒ 2m 0.90m and 0.45m
⇒2(2×0.90+0.90×0.45+0.45×2)
⇒2(1.8+0.405+0.9)
⇒ 6.21 m²
Now, The total area of three boxes.
⇒Area of box with dimesions (1.5m,0.85m 0.20m) + Area of box with dimesions (2 m 0.65m 0.35m) + Area of box with dimesions (2m,0.90m 0.45m).
⇒ (6.55+4.455+6.21)m²
⇒17.215 m²
⇒Now, Cost of painiting per m² = Rs. 5 Cost of
painiting 17.215 m²
⇒Rs (5 ×17.215)
⇒₹ 86.075