-86.75% is the change from 770 to 102
Calculation steps:
[( 102 - 770 ) ÷ 770] x 100 = -86.75%
Formula
Percentage change = [(102 - 770) / 770] x 100
Subtract the new number by the original number
102 - 770 = -668
-668 ÷ 770 = -0.8675324675324675
-0.8675324675324675 x 100 = -86.75%