-89.45% is the change from 768 to 81
Calculation steps:
[( 81 - 768 ) ÷ 768] x 100 = -89.45%
Formula
Percentage change = [(81 - 768) / 768] x 100
Subtract the new number by the original number
81 - 768 = -687
-687 ÷ 768 = -0.89453125
-0.89453125 x 100 = -89.45%