The floor of a room is in the shape of a square. If the length of one of its side is 4 m, then find the cost of carpeting the room at the rate of ₹ 40 per square meter.
Given, side of square = 4 cm
⇒ Area of a square = Side × Side
= 4 m × 4 m
= 16 m2
Cost of carpeting 1 sq m of a room = ₹ 40
Cost of carpeting 16 sq m
=40×16=₹ 640
Therefore, total cost of carpeting = ₹ 640