-89.22% is the change from 770 to 83
Calculation steps:
[( 83 - 770 ) ÷ 770] x 100 = -89.22%
Formula
Percentage change = [(83 - 770) / 770] x 100
Subtract the new number by the original number
83 - 770 = -687
-687 ÷ 770 = -0.8922077922077922
-0.8922077922077922 x 100 = -89.22%