-83.38% is the change from 770 to 128
Calculation steps:
[( 128 - 770 ) ÷ 770] x 100 = -83.38%
Formula
Percentage change = [(128 - 770) / 770] x 100
Subtract the new number by the original number
128 - 770 = -642
-642 ÷ 770 = -0.8337662337662337
-0.8337662337662337 x 100 = -83.38%