30 × (1 - 20/100) is 24

Follow the following steps to work out percentage problems of the form "What is 20 percent off 30?".

- 20% of 30: (20 / 100) * 30 =
*6* - 20% off 30:
*30*-*6* - =
*24*

In a standard calculator that supports percentage arithmetic, you can arrive at the answer by pressing **30** - **20** %.

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