-55.8% is the change from 905 to 400
Calculation steps:
[( 400 - 905 ) ÷ 905] x 100 = -55.8%
Formula
Percentage change = [(400 - 905) / 905] x 100
Subtract the new number by the original number
400 - 905 = -505
-505 ÷ 905 = -0.5580110497237569
-0.5580110497237569 x 100 = -55.8%