Input: To calculate the percentage change from an initial value of 10000000 to a final value of 30000000, follow these steps:

Step 1: Calculate the difference between the final value and the initial value. In this case, the difference is 30000000 - 10000000 = 20000000.

Step 2: Divide the difference by the initial value and multiply by 100 to get the percentage change. In this case, the percentage change is (20000000 / 10000000) x 100 = 200%.

Step 3: Interpret the result. A percentage change of 200% means that the final value is three times the initial value. In other words, the value has increased by 200% or doubled twice.

Therefore, the percentage change from an initial value of 10000000 to a final value of 30000000 is 200%.