A structure with 8′ high walls is to be constructed of 8″ x 8′ x 16″ concrete masonry units. The structure is 20′ wide by 40′ long, there are no windows or doors. Assuming no waste, how many 8″ x 8″ x 16″ CMU’s will be needed to build this structure?

A structure with 8′ high walls is to be constructed of 8″ x 8′ x 16″ concrete masonry units. The structure is 20′ wide by 40′ long, there are no windows or doors. Assuming no waste, how many 8″ x 8″ x 16″ CMU’s will be needed to build this structure?