-15.26% is the change from 780 to 661
Calculation steps:
[( 661 - 780 ) ÷ 780] x 100 = -15.26%
Formula
Percentage change = [(661 - 780) / 780] x 100
Subtract the new number by the original number
661 - 780 = -119
-119 ÷ 780 = -0.15256410256410258
-0.15256410256410258 x 100 = -15.26%