-56.52% is the change from 920 to 400
Calculation steps:
[( 400 - 920 ) ÷ 920] x 100 = -56.52%
Formula
Percentage change = [(400 - 920) / 920] x 100
Subtract the new number by the original number
400 - 920 = -520
-520 ÷ 920 = -0.5652173913043478
-0.5652173913043478 x 100 = -56.52%