Step 1: Start with the fraction 86/99.

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

86 ÷ 99 = 0.8687

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

0.8687 × 100 = 86.87%

Final Answer: 86/99 as a percentage is 86.87%.