-98.07% is the change from 779 to 15
Calculation steps:
[( 15 - 779 ) ÷ 779] x 100 = -98.07%
Formula
Percentage change = [(15 - 779) / 779] x 100
Subtract the new number by the original number
15 - 779 = -764
-764 ÷ 779 = -0.9807445442875481
-0.9807445442875481 x 100 = -98.07%