-87.18% is the change from 780 to 100
Calculation steps:
[( 100 - 780 ) ÷ 780] x 100 = -87.18%
Formula
Percentage change = [(100 - 780) / 780] x 100
Subtract the new number by the original number
100 - 780 = -680
-680 ÷ 780 = -0.8717948717948718
-0.8717948717948718 x 100 = -87.18%