-89.87% is the change from 770 to 78
Calculation steps:
[( 78 - 770 ) ÷ 770] x 100 = -89.87%
Formula
Percentage change = [(78 - 770) / 770] x 100
Subtract the new number by the original number
78 - 770 = -692
-692 ÷ 770 = -0.8987012987012987
-0.8987012987012987 x 100 = -89.87%