-39.56% is the change from 910 to 550
Calculation steps:
[( 550 - 910 ) ÷ 910] x 100 = -39.56%
Formula
Percentage change = [(550 - 910) / 910] x 100
Subtract the new number by the original number
550 - 910 = -360
-360 ÷ 910 = -0.3956043956043956
-0.3956043956043956 x 100 = -39.56%