Step 1: Start with the fraction 100/25.

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

100 ÷ 25 = 4.0

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

4.0 × 100 = 400.0%

Final Answer: 100/25 as a percentage is 400.0%.