-40.67% is the change from 831 to 493
Calculation steps:
[( 493 - 831 ) ÷ 831] x 100 = -40.67%
Formula
Percentage change = [(493 - 831) / 831] x 100
Subtract the new number by the original number
493 - 831 = -338
-338 ÷ 831 = -0.40673886883273164
-0.40673886883273164 x 100 = -40.67%