-19.64% is the change from 550 to 442
Calculation steps:
[( 442 - 550 ) ÷ 550] x 100 = -19.64%
Formula
Percentage change = [(442 - 550) / 550] x 100
Subtract the new number by the original number
442 - 550 = -108
-108 ÷ 550 = -0.19636363636363635
-0.19636363636363635 x 100 = -19.64%