If you would like to know what is the area of the wall, you can calculate this using the following steps:
area = length * width
area = 9 1/3 feet * 8 1/8 feet = 28/3 feet * 65/8 feet = 455/6 = 75 5/6 square feet
The area of the wall is 75 5/6 square feet.
If the mural is 100 square feet, it won't fit on the wall, because 100 > 75 5/6.