15 of 100 refers to finding 15 percent of 100. To calculate this, you can use the formula:
Percentage Value = (Percentage Rate / 100) × Total Value
In this case, the percentage rate is 15 and the total value is 100. Plugging these numbers into the formula gives:
Percentage Value = (15 / 100) × 100 = 15
So, 15 of 100 is equal to 15. This means that when you take 15 percent of 100, you end up with 15.