-40.91% is the change from 831 to 491
Calculation steps:
[( 491 - 831 ) ÷ 831] x 100 = -40.91%
Formula
Percentage change = [(491 - 831) / 831] x 100
Subtract the new number by the original number
491 - 831 = -340
-340 ÷ 831 = -0.4091456077015644
-0.4091456077015644 x 100 = -40.91%