-98.31% is the change from 770 to 13
Calculation steps:
[( 13 - 770 ) ÷ 770] x 100 = -98.31%
Formula
Percentage change = [(13 - 770) / 770] x 100
Subtract the new number by the original number
13 - 770 = -757
-757 ÷ 770 = -0.9831168831168832
-0.9831168831168832 x 100 = -98.31%