Question

The perimeter of a square courtyard is 144 m. Find, the cost of cementing it at the rate of $5 per m${}^2$ .

• A. $6480
• B. $6500
• C. $6300
• D. $6400

Answer 1

The correct option is A

$6480

Perimeter of square courtyard = 144 m
Therefore, side of the square courtyard = $\frac{144}{4}$ = 36 m
Therefore, area of square courtyard = 36 $\times$ 36 m${}^2$= 1296 m${}^2$
For 1 m${}^2$, the cost of cementing = $5
For 1296 m${}^2$, the cost of cementing = $1296 $\times$ 5 = $6480