Calculating the Perimeter of a Rectangular Garden

Sarah is making a rectangular garden in her backyard. The length of the garden is 12 feet and the width is 9 feet. She wants to know the total length of fencing she needs to surround the garden. To find the total length of fencing required, calculate the perimeter of the rectangle using the formula:

$$ P = 2 imes (L + W) $$

Where $P$ is the perimeter, $L$ is the length, and $W$ is the width of the rectangle. What is the total length of fencing that Sarah needs?