The percentage change from 25000 to 50000 can be calculated using the following steps:

Step 1: Calculate the difference between the two values. In this case, the difference is 50000 - 25000 = 25000.

Step 2: Divide the difference by the original value (25000) and multiply by 100 to get the percentage change. So, (25000/25000) * 100 = 100%.

Step 3: Subtract 100% from the percentage change to get the actual percentage increase. In this case, the percentage increase is 100% - 100% = 0%.

Therefore, the percentage change from 25000 to 50000 is 100%, but there is no actual percentage increase as the final value is double the initial value.