Step 1: Start with the fraction 25/8.

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

25 ÷ 8 = 3.125

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

3.125 × 100 = 312.5%

Final Answer: 25/8 as a percentage is 312.5%.