Referring to the illustration, if the sidewalk pictured is 100 feet long, what is the total number of cubic yards of concrete required? ( This will be a cross section of a sidewalk 12` 6″ wide 4″ thick with a 1` deep 6″ wide footing on the left side. )

Referring to the illustration, if the sidewalk pictured is 100 feet long, what is the total number of cubic yards of concrete required? ( This will be a cross section of a sidewalk 12` 6″ wide 4″ thick with a 1` deep 6″ wide footing on the left side. )