-55.85% is the change from 906 to 400
Calculation steps:
[( 400 - 906 ) ÷ 906] x 100 = -55.85%
Formula
Percentage change = [(400 - 906) / 906] x 100
Subtract the new number by the original number
400 - 906 = -506
-506 ÷ 906 = -0.5584988962472406
-0.5584988962472406 x 100 = -55.85%