-8.78% is the change from 831 to 758
Calculation steps:
[( 758 - 831 ) ÷ 831] x 100 = -8.78%
Formula
Percentage change = [(758 - 831) / 831] x 100
Subtract the new number by the original number
758 - 831 = -73
-73 ÷ 831 = -0.08784596871239471
-0.08784596871239471 x 100 = -8.78%