-6.14% is the change from 831 to 780
Calculation steps:
[( 780 - 831 ) ÷ 831] x 100 = -6.14%
Formula
Percentage change = [(780 - 831) / 831] x 100
Subtract the new number by the original number
780 - 831 = -51
-51 ÷ 831 = -0.061371841155234655
-0.061371841155234655 x 100 = -6.14%