-90.15% is the change from 843 to 83
Calculation steps:
[( 83 - 843 ) ÷ 843] x 100 = -90.15%
Formula
Percentage change = [(83 - 843) / 843] x 100
Subtract the new number by the original number
83 - 843 = -760
-760 ÷ 843 = -0.9015421115065243
-0.9015421115065243 x 100 = -90.15%