-88.31% is the change from 770 to 90
Calculation steps:
[( 90 - 770 ) ÷ 770] x 100 = -88.31%
Formula
Percentage change = [(90 - 770) / 770] x 100
Subtract the new number by the original number
90 - 770 = -680
-680 ÷ 770 = -0.8831168831168831
-0.8831168831168831 x 100 = -88.31%