-90.18% is the change from 825 to 81
Calculation steps:
[( 81 - 825 ) ÷ 825] x 100 = -90.18%
Formula
Percentage change = [(81 - 825) / 825] x 100
Subtract the new number by the original number
81 - 825 = -744
-744 ÷ 825 = -0.9018181818181819
-0.9018181818181819 x 100 = -90.18%