-90% is the change from 890 to 89
Calculation steps:
[( 89 - 890 ) ÷ 890] x 100 = -90%
Formula
Percentage change = [(89 - 890) / 890] x 100
Subtract the new number by the original number
89 - 890 = -801
-801 ÷ 890 = -0.9
-0.9 x 100 = -90%
Example