Calculating Total Length of Wooden Border for Flower Bed

Ella is planning to create a rectangular flower bed in her backyard. The flower bed will have a length of 9 feet and a width of 4 feet. She is also considering adding a wooden border around the flower bed that is 1 foot wide. To find out the total length of the wooden border needed, she needs to calculate the perimeter of the flower bed including the border.

What is the total length of the wooden border Ella needs to buy?