-16.65% is the change from 775 to 646
Calculation steps:
[( 646 - 775 ) ÷ 775] x 100 = -16.65%
Formula
Percentage change = [(646 - 775) / 775] x 100
Subtract the new number by the original number
646 - 775 = -129
-129 ÷ 775 = -0.1664516129032258
-0.1664516129032258 x 100 = -16.65%