-6.68% is the change from 823 to 768
Calculation steps:
[( 768 - 823 ) ÷ 823] x 100 = -6.68%
Formula
Percentage change = [(768 - 823) / 823] x 100
Subtract the new number by the original number
768 - 823 = -55
-55 ÷ 823 = -0.06682867557715674
-0.06682867557715674 x 100 = -6.68%