To find out what percentage 22.5 is of 90, we can use the following formula:
Percentage = (Part / Whole) * 100
In this case, the Part is 22.5 and the Whole is 90. Plugging in the numbers:
Percentage = (22.5 / 90) * 100
Now, we divide 22.5 by 90, which gives us 0.25. Then we multiply by 100:
0.25 * 100 = 25
Therefore, 22.5 is 25% of 90.