-18.55% is the change from 550 to 448
Calculation steps:
[( 448 - 550 ) ÷ 550] x 100 = -18.55%
Formula
Percentage change = [(448 - 550) / 550] x 100
Subtract the new number by the original number
448 - 550 = -102
-102 ÷ 550 = -0.18545454545454546
-0.18545454545454546 x 100 = -18.55%