-30.06% is the change from 173 to 121
Calculation steps:
[( 121 - 173 ) ÷ 173] x 100 = -30.06%
Formula
Percentage change = [(121 - 173) / 173] x 100
Subtract the new number by the original number
121 - 173 = -52
-52 ÷ 173 = -0.30057803468208094
-0.30057803468208094 x 100 = -30.06%