-91.09% is the change from 101 to 9
Calculation steps:
[( 9 - 101 ) ÷ 101] x 100 = -91.09%
Formula
Percentage change = [(9 - 101) / 101] x 100
Subtract the new number by the original number
9 - 101 = -92
-92 ÷ 101 = -0.9108910891089109
-0.9108910891089109 x 100 = -91.09%