-17.65% is the change from 170 to 140
Calculation steps:
[( 140 - 170 ) ÷ 170] x 100 = -17.65%
Formula
Percentage change = [(140 - 170) / 170] x 100
Subtract the new number by the original number
140 - 170 = -30
-30 ÷ 170 = -0.17647058823529413
-0.17647058823529413 x 100 = -17.65%