-3.89% is the change from 180 to 173
Calculation steps:
[( 173 - 180 ) ÷ 180] x 100 = -3.89%
Formula
Percentage change = [(173 - 180) / 180] x 100
Subtract the new number by the original number
173 - 180 = -7
-7 ÷ 180 = -0.03888888888888889
-0.03888888888888889 x 100 = -3.89%