Step 1: Start with the fraction 81/4.

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

81 ÷ 4 = 20.25

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

20.25 × 100 = 2025.0%

Final Answer: 81/4 as a percentage is 2025.0%.