Determine what a specific percentage is of another number. For example, enter 600 x 15 and hit the percent key. You see the answer is 90, which means that 90 is 15 percent of 600.
Calculate a percentage of a number and add it to the number. For example, enter 34 + 7 and hit the percent key. You immediately see the answer is 36.38. This is useful for figuring sales tax on purchase items.
Figure a percentage of a number and subtract it from the number. For example, enter 79 -- 30 and hit the percent key. You see the answer is 55.3. This is useful for figuring sale prices on purchase items.