Description for Correct answer:
Area of rectangle (A) = \( \Large l \times b \)

\( \Large 12500 = 125 \times b \)

Therefore, \( \Large b = \frac{12500}{125} \)

Therefore, b = 100 m

Now perimetre of rectangle = \( \Large 2 \left(l+b\right) \)

= \( \Large 2 \left(125+100\right) \)

= 450 m