-80% is the change from 140 to 28
Calculation steps:
[( 28 - 140 ) ÷ 140] x 100 = -80%
Formula
Percentage change = [(28 - 140) / 140] x 100
Subtract the new number by the original number
28 - 140 = -112
-112 ÷ 140 = -0.8
-0.8 x 100 = -80%
Example