Step 1: Start with the fraction 31/40.

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

31 ÷ 40 = 0.775

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

0.775 × 100 = 77.5%

Final Answer: 31/40 as a percentage is 77.5%.