-51.69% is the change from 828 to 400
Calculation steps:
[( 400 - 828 ) ÷ 828] x 100 = -51.69%
Formula
Percentage change = [(400 - 828) / 828] x 100
Subtract the new number by the original number
400 - 828 = -428
-428 ÷ 828 = -0.5169082125603864
-0.5169082125603864 x 100 = -51.69%