Weekly production rises from 220 units to 275 units. What is the percent increase?

Correct answer to question 66 (Arithmetic Reasoning): 25 percent

Method

The rise is 275 - 220 = 55 units, and 55 divided by the original 220 is 0.25, or 25 percent. Dividing by the new figure of 275 gives 20 percent, which is the usual mistake.