-51.09% is the change from 828 to 405
Calculation steps:
[( 405 - 828 ) ÷ 828] x 100 = -51.09%
Formula
Percentage change = [(405 - 828) / 828] x 100
Subtract the new number by the original number
405 - 828 = -423
-423 ÷ 828 = -0.5108695652173914
-0.5108695652173914 x 100 = -51.09%