-28.9% is the change from 173 to 123
Calculation steps:
[( 123 - 173 ) ÷ 173] x 100 = -28.9%
Formula
Percentage change = [(123 - 173) / 173] x 100
Subtract the new number by the original number
123 - 173 = -50
-50 ÷ 173 = -0.28901734104046245
-0.28901734104046245 x 100 = -28.9%