-83.12% is the change from 770 to 130
Calculation steps:
[( 130 - 770 ) ÷ 770] x 100 = -83.12%
Formula
Percentage change = [(130 - 770) / 770] x 100
Subtract the new number by the original number
130 - 770 = -640
-640 ÷ 770 = -0.8311688311688312
-0.8311688311688312 x 100 = -83.12%