Input: To calculate the percentage change from 500000 to 1500000, we need to follow the below steps:

Step 1: Find the difference between the two numbers.

1500000 - 500000 = 1000000

Step 2: Divide the difference by the original number.

1000000 / 500000 = 2

Step 3: Multiply the result by 100 to get the percentage change.

2 * 100 = 200%

Therefore, the percentage change from 500000 to 1500000 is 200%. This means that the final value is 200% greater than the initial value. Alternatively, we can say that the final value is three times the initial value (since 200% of 500000 is 1000000, and adding that to the initial value gives us 1500000).