-91.56% is the change from 960 to 81
Calculation steps:
[( 81 - 960 ) ÷ 960] x 100 = -91.56%
Formula
Percentage change = [(81 - 960) / 960] x 100
Subtract the new number by the original number
81 - 960 = -879
-879 ÷ 960 = -0.915625
-0.915625 x 100 = -91.56%