A university's campus has 20,000 computers with cathode-ray tube monitors that are powered-up even when the computer is not being used. This type of monitor is relatively inefficient, and it draws more power than a flat panel display.
(a) If each cathode-ray tube monitor draws 0.1 kW of power over the course of a year, how much energy has been consumed?
(b) At the cost of seven cents per kW-h, how much does it cost the university each year to keep these monitors powered-up?
(c) On average, a computer monitor that has the automatic sleep feature enabled will consume 72% less energy than one that is continually powered. What is the cost savings associated with enabling this feature on all of the university's computers?