Percentage in common phrases refers to everyday situations where we need to calculate or understand percentages. These often come in three main forms:

- What is X% of Y?
- X is what % of Y?
- X is Y% of what?

The calculation method depends on which phrase you're working with:

- For "What is X% of Y?": Multiply Y by X/100
- For "X is what % of Y?": Divide X by Y, then multiply by 100
- For "X is Y% of what?": Divide X by (Y/100)

The formulas for each phrase are:

- What is X% of Y?: \( \text{Result} = Y \times \frac{X}{100} \)
- X is what % of Y?: \( \text{Percentage} = \frac{X}{Y} \times 100\% \)
- X is Y% of what?: \( \text{Total} = \frac{X}{\frac{Y}{100}} \)

- Identify which phrase you're working with
- Determine the known values
- Apply the appropriate formula
- Perform the calculation
- Round the result if necessary

Let's solve an example for each phrase:

- What is 15% of 80?

15% of 80 = 80 × (15/100) = 12 - 25 is what % of 100?

(25/100) × 100% = 25% - 30 is 75% of what?

30 / (75/100) = 40

*Visual representation of percentage phrases examples*

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