-89% is the change from 100 to 11
Calculation steps:
[( 11 - 100 ) ÷ 100] x 100 = -89%
Formula
Percentage change = [(11 - 100) / 100] x 100
Subtract the new number by the original number
11 - 100 = -89
-89 ÷ 100 = -0.89
-0.89 x 100 = -89%
Example