Step 1: Start with the fraction 39/12.

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

39 ÷ 12 = 3.25

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

3.25 × 100 = 325.0%

Final Answer: 39/12 as a percentage is 325.0%.