-17.72% is the change from 779 to 641
Calculation steps:
[( 641 - 779 ) ÷ 779] x 100 = -17.72%
Formula
Percentage change = [(641 - 779) / 779] x 100
Subtract the new number by the original number
641 - 779 = -138
-138 ÷ 779 = -0.17715019255455713
-0.17715019255455713 x 100 = -17.72%