Which of the following is not a productivity measure?
A. In a restaurant: the pounds of hamburger used divided by gallons of catsup used.
B. in a university: the number of semester credit hours taught by associate and full professors
C. For Cowatt- carpet installation: the number of yards installed divided by man-hours required for installation
D. In a machine shop: units of output divided by number of machines
E. in a hotel: monthly sales divided by kilowatt-hours used