-5.56% is the change from 180 to 170
Calculation steps:
[( 170 - 180 ) ÷ 180] x 100 = -5.56%
Formula
Percentage change = [(170 - 180) / 180] x 100
Subtract the new number by the original number
170 - 180 = -10
-10 ÷ 180 = -0.05555555555555555
-0.05555555555555555 x 100 = -5.56%