Input: To calculate the percentage change from 45 to 50, we need to follow the below steps:

Step 1: Find the difference between the new value and the old value. In this case, the difference is 50 - 45 = 5.

Step 2: Divide the difference by the old value. In this case, 5/45 = 0.1111.

Step 3: Multiply the result by 100 to get the percentage change. In this case, 0.1111 x 100 = 11.11%.

Therefore, the percentage change from 45 to 50 is 11.11%. This means that the value has increased by 11.11% from its original value of 45. To put it in simpler terms, if you had 45 apples and the percentage change was 11.11%, you would now have 50 apples.