Step 1: Start with the fraction 13/40.

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

13 ÷ 40 = 0.325

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

0.325 × 100 = 32.5%

Final Answer: 13/40 as a percentage is 32.5%.