Step 1: Start with the fraction 78/12.

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

78 ÷ 12 = 6.5

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

6.5 × 100 = 650.0%

Final Answer: 78/12 as a percentage is 650.0%.