-51.02% is the change from 831 to 407
Calculation steps:
[( 407 - 831 ) ÷ 831] x 100 = -51.02%
Formula
Percentage change = [(407 - 831) / 831] x 100
Subtract the new number by the original number
407 - 831 = -424
-424 ÷ 831 = -0.5102286401925391
-0.5102286401925391 x 100 = -51.02%