-12.35% is the change from 170 to 149
Calculation steps:
[( 149 - 170 ) ÷ 170] x 100 = -12.35%
Formula
Percentage change = [(149 - 170) / 170] x 100
Subtract the new number by the original number
149 - 170 = -21
-21 ÷ 170 = -0.12352941176470589
-0.12352941176470589 x 100 = -12.35%