To find the percentage change from 55000000 to 25000000, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 25000000 - 55000000

Difference = -30000000

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 = |-30000000|

Absolute Difference = 30000000

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

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

Percentage Change = (30000000 / 55000000) x 100

Percentage Change = 54.55%

Therefore, the percentage change from 55000000 to 25000000 is -54.55%. This means that there was a decrease of 54.55% from 55000000 to 25000000.