To find the percentage change from 500000 to 50000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 50000 - 500000

Difference = -450000

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 = |-450000|

Absolute Difference = 450000

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

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

Percentage Change = (450000 / 500000) x 100

Percentage Change = 90%

Therefore, the percentage change from 500000 to 50000 is -90%. This means that there was a decrease of 90% from 500000 to 50000.