-9.72% is the change from 864 to 780
Calculation steps:
[( 780 - 864 ) ÷ 864] x 100 = -9.72%
Formula
Percentage change = [(780 - 864) / 864] x 100
Subtract the new number by the original number
780 - 864 = -84
-84 ÷ 864 = -0.09722222222222222
-0.09722222222222222 x 100 = -9.72%