-60.17% is the change from 831 to 331
Calculation steps:
[( 331 - 831 ) ÷ 831] x 100 = -60.17%
Formula
Percentage change = [(331 - 831) / 831] x 100
Subtract the new number by the original number
331 - 831 = -500
-500 ÷ 831 = -0.601684717208183
-0.601684717208183 x 100 = -60.17%