Step 1: Start with the fraction 15/12.

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

15 ÷ 12 = 1.25

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

1.25 × 100 = 125.0%

Final Answer: 15/12 as a percentage is 125.0%.