Input: To calculate the percentage change from 550 to 300, we need to follow the below steps:

Step 1: Find the difference between the two numbers.

550 - 300 = 250

Step 2: Divide the difference by the original number.

250 / 550 = 0.4545

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

0.4545 x 100 = 45.45%

Therefore, the percentage change from 550 to 300 is a decrease of 45.45%.