1. The problem asks to convert the fraction $\frac{9}{20}$ into a percentage. 2. To convert a fraction to a percentage, multiply the fraction by 100 and add the percent sign (%). 3. Using the formula: $$\text{Percentage} = \frac{\text{Numerator}}{\text{Denominator}} \times 100$$ 4. Substitute the values: $$\frac{9}{20} \times 100$$ 5. Multiply numerator and denominator: $$\frac{9 \times 100}{20} = \frac{900}{20}$$ 6. Simplify the fraction by dividing numerator and denominator by 20: $$\frac{\cancel{900}^{45}}{\cancel{20}^1} = 45$$ 7. So, $\frac{9}{20}$ as a percentage is $45\%$.