-70.28% is the change from 831 to 247
Calculation steps:
[( 247 - 831 ) ÷ 831] x 100 = -70.28%
Formula
Percentage change = [(247 - 831) / 831] x 100
Subtract the new number by the original number
247 - 831 = -584
-584 ÷ 831 = -0.7027677496991577
-0.7027677496991577 x 100 = -70.28%