-6.25% is the change from 864 to 810
Calculation steps:
[( 810 - 864 ) ÷ 864] x 100 = -6.25%
Formula
Percentage change = [(810 - 864) / 864] x 100
Subtract the new number by the original number
810 - 864 = -54
-54 ÷ 864 = -0.0625
-0.0625 x 100 = -6.25%