To solve this question, we need to know the meaning of a percent. 'Cent' means per one hundred, so a percent is a value per 100. That means that 20 percent is 20/100 (20 per one hundred). To find what 20 percent of a number is, we multiply the fractional form of 20 percent (20/100) and the number.
20/100 * 135=
=1/5 * 135=
=135/5=
=27
That means that 20% of $135 is $27