To find the percentage change from 500 to 8500, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 8500 - 500

Difference = 8000

Step 2: Next, we need to find the absolute value of the difference. This is because percentage change is always calculated as a positive value.

Absolute Difference = |Difference|

Absolute Difference = |8000|

Absolute Difference = 8000

Step 3: Now, we can calculate the percentage change using the formula:

Percentage Change = (Absolute Difference / Initial Value) x 100

Percentage Change = (8000 / 500) x 100

Percentage Change = 1600%

Therefore, the percentage change from 500 to 8500 is 1600%. This means that there was an increase of 1600% from 500 to 8500.