-42.86% is the change from 140 to 80
Calculation steps:
[( 80 - 140 ) ÷ 140] x 100 = -42.86%
Formula
Percentage change = [(80 - 140) / 140] x 100
Subtract the new number by the original number
80 - 140 = -60
-60 ÷ 140 = -0.42857142857142855
-0.42857142857142855 x 100 = -42.86%