45/309 = ≈14.56%
Rounded to 2 decimal places.
The fraction 45/309 could represent something like 45 students out of 309 choosing a certain after-school activity, or 45 defective items in a shipment of 309. In everyday terms, that is about 14.56%, so it describes a group that is noticeable but still much smaller than the whole.
To picture it quickly, think of 45 out of every 300 people, objects, or events. Since 15% of 300 is 45, you can estimate this fraction as being just under 15%, or about 1 out of every 7 people.
A common mistake is treating 45/309 as if it were close to 45%, because the numerator is 45. The denominator matters just as much: 45 is being compared with a total of 309, not with 100.