Find the total cost of painting the outside of a closed cuboidal box, which is 7 m long, 5m wide and 2m high, at the rate of ₹2.4 per m².

₹283.20

We know that, Total surface area of cuboid = 2 (lb + bh + hl)

Given,

Length of box = 7 m

Breadth of box = 5 m

Height of box = 2 m

Rate of painting the box = Rs 2.4 per m²

Total surface area = 2 (7 × 5 + 5 × 2 + 2 × 7)

Total area = 2 × (35 + 10 + 14) = 2 × 59 = 118 m²

Total price of painting the outside of a box = 2.4 × 118 = Rs 283.20