-7.64% is the change from 550 to 508
Calculation steps:
[( 508 - 550 ) ÷ 550] x 100 = -7.64%
Formula
Percentage change = [(508 - 550) / 550] x 100
Subtract the new number by the original number
508 - 550 = -42
-42 ÷ 550 = -0.07636363636363637
-0.07636363636363637 x 100 = -7.64%