-8.26% is the change from 109 to 100
Calculation steps:
[( 100 - 109 ) ÷ 109] x 100 = -8.26%
Formula
Percentage change = [(100 - 109) / 109] x 100
Subtract the new number by the original number
100 - 109 = -9
-9 ÷ 109 = -0.08256880733944955
-0.08256880733944955 x 100 = -8.26%