29.31% is what you get when you turn the fraction 17/58 into a percentage. It’s a quick way to see how big the part is compared to a whole.
The fraction 17/58 shows that 17 out of every 58 equal pieces are taken. In everyday life you might see something like this when you split a pizza into 58 slices and give 17 slices to a friend. Knowing the percentage (about 30%) makes it easier to compare with other situations.
The number is rounded to two decimal places, so the exact value is a little bit higher or lower, but 29.31% is accurate enough for most practical uses. This rounded figure lets you work with the fraction without having to keep a long string of decimal digits.