Step 1: Start with the fraction 17/40.

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

17 ÷ 40 = 0.425

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

0.425 × 100 = 42.5%

Final Answer: 17/40 as a percentage is 42.5%.