Question

Find the cost of covering the four walls of a cube of side length 5 cm at the rate of ₹ 10/cm${}^2$ = ₹.

• A. 1000
• B. 100
• C. 500
• D. 750

Answer 1

The correct option is A 1000

The area of the cloth required = area of the four walls of the cube = lateral surface area of the cube = 4(side)${}^2$.
Hence, area of the cloth required = 4(5 cm)${}^2$ = 100 cm ${}^2$.
Hence, the effective cost = 100 cm ${}^2$ $\times$ ₹ 10/cm${}^2$ = ₹ 1000.