Step 1: Start with the fraction 20/4.

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

20 ÷ 4 = 5.0

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

5.0 × 100 = 500.0%

Final Answer: 20/4 as a percentage is 500.0%.