-90.1% is the change from 899 to 89
Calculation steps:
[( 89 - 899 ) ÷ 899] x 100 = -90.1%
Formula
Percentage change = [(89 - 899) / 899] x 100
Subtract the new number by the original number
89 - 899 = -810
-810 ÷ 899 = -0.9010011123470523
-0.9010011123470523 x 100 = -90.1%