-50.8% is the change from 813 to 400
Calculation steps:
[( 400 - 813 ) ÷ 813] x 100 = -50.8%
Formula
Percentage change = [(400 - 813) / 813] x 100
Subtract the new number by the original number
400 - 813 = -413
-413 ÷ 813 = -0.5079950799507995
-0.5079950799507995 x 100 = -50.8%