1. The problem asks: What is 30% of 90? 2. To find a percentage of a number, use the formula: $$\text{Percentage of a number} = \frac{\text{percent}}{100} \times \text{number}$$ 3. Substitute the values: 30% means 30, and the number is 90. $$30\% \text{ of } 90 = \frac{30}{100} \times 90$$ 4. Simplify the fraction: $$= \frac{\cancel{30}}{\cancel{100}} \times 90 = \frac{3}{10} \times 90$$ 5. Multiply: $$= 3 \times 9 = 27$$ 6. Therefore, 30% of 90 is 27.