-88.61% is the change from 79 to 9
Calculation steps:
[( 9 - 79 ) ÷ 79] x 100 = -88.61%
Formula
Percentage change = [(9 - 79) / 79] x 100
Subtract the new number by the original number
9 - 79 = -70
-70 ÷ 79 = -0.8860759493670886
-0.8860759493670886 x 100 = -88.61%