-39.23% is the change from 905 to 550
Calculation steps:
[( 550 - 905 ) ÷ 905] x 100 = -39.23%
Formula
Percentage change = [(550 - 905) / 905] x 100
Subtract the new number by the original number
550 - 905 = -355
-355 ÷ 905 = -0.39226519337016574
-0.39226519337016574 x 100 = -39.23%