-16.79% is the change from 780 to 649
Calculation steps:
[( 649 - 780 ) ÷ 780] x 100 = -16.79%
Formula
Percentage change = [(649 - 780) / 780] x 100
Subtract the new number by the original number
649 - 780 = -131
-131 ÷ 780 = -0.16794871794871793
-0.16794871794871793 x 100 = -16.79%