Step 1: Start with the fraction 12/7.

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

12 ÷ 7 = 1.7143

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

1.7143 × 100 = 171.43%

Final Answer: 12/7 as a percentage is 171.43%.