Power Supply

Note: This question deals with the idea of percent efficiency with machines.

Mr. Milanese's computer died last month, and he eventually realized it was the power source that had gone bad. After shopping around, he found a new power supply (pictured above) that was much more energy efficient than the previous power supply. He collected some data and organized it in the table (also pictured above). The x column is the amount of energy (in joules) that was put into the power supply, and the f(x) column is the amount of energy that it put out. Follow the directions on "The Checklist" to answer Mr. Milanese's questions.