-89.26% is the change from 121 to 13
Calculation steps:
[( 13 - 121 ) ÷ 121] x 100 = -89.26%
Formula
Percentage change = [(13 - 121) / 121] x 100
Subtract the new number by the original number
13 - 121 = -108
-108 ÷ 121 = -0.8925619834710744
-0.8925619834710744 x 100 = -89.26%