Calculating the Perimeter of a Rectangular Garden

David is building a rectangular garden in his backyard. The length of the garden is 12 feet, and the width is 8 feet. He wants to place a wooden fence around the garden to define its boundaries. To the nearest tenth of a foot, what is the total length of the fence that David will need to purchase?

Use the formula for the perimeter of a rectangle, which is given by:

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

where $$ L $$ is the length and $$ W $$ is the width.