-70.52% is the change from 831 to 245
Calculation steps:
[( 245 - 831 ) ÷ 831] x 100 = -70.52%
Formula
Percentage change = [(245 - 831) / 831] x 100
Subtract the new number by the original number
245 - 831 = -586
-586 ÷ 831 = -0.7051744885679904
-0.7051744885679904 x 100 = -70.52%