-53% is the change from 851 to 400
Calculation steps:
[( 400 - 851 ) ÷ 851] x 100 = -53%
Formula
Percentage change = [(400 - 851) / 851] x 100
Subtract the new number by the original number
400 - 851 = -451
-451 ÷ 851 = -0.5299647473560517
-0.5299647473560517 x 100 = -53%