Step 1: Start with the fraction 72/80.

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

72 ÷ 80 = 0.9

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

0.9 × 100 = 90.0%

Final Answer: 72/80 as a percentage is 90.0%.