-88.41% is the change from 690 to 80
Calculation steps:
[( 80 - 690 ) ÷ 690] x 100 = -88.41%
Formula
Percentage change = [(80 - 690) / 690] x 100
Subtract the new number by the original number
80 - 690 = -610
-610 ÷ 690 = -0.8840579710144928
-0.8840579710144928 x 100 = -88.41%