Step 1: Start with the fraction 3/20.

Step 2: To convert a fraction into a percentage, divide the numerator by the denominator.

3 ÷ 20 = 0.15

Step 3: Multiply the result by 100 to get the percentage.

0.15 × 100 = 15.0%

Final Answer: 3/20 as a percentage is 15.0%.