-89.69% is the change from 960 to 99
Calculation steps:
[( 99 - 960 ) ÷ 960] x 100 = -89.69%
Formula
Percentage change = [(99 - 960) / 960] x 100
Subtract the new number by the original number
99 - 960 = -861
-861 ÷ 960 = -0.896875
-0.896875 x 100 = -89.69%