18/99 as a percentage is 18.18%. This is the rounded value you get when you turn the fraction into a percent with two decimal places. It’s a handy number to remember for quick estimates.
The fraction 18/99 can also be written as the decimal 0.1818… where the “18” repeats forever. Because the decimal repeats, the percent will always stay at 18.18% when rounded to two places.
In everyday use, you might see 18/99 in statistics or simple ratios. Knowing its percent form helps you compare it easily with other percentages without doing any extra math.