-78.57% is the change from 140 to 30
Calculation steps:
[( 30 - 140 ) ÷ 140] x 100 = -78.57%
Formula
Percentage change = [(30 - 140) / 140] x 100
Subtract the new number by the original number
30 - 140 = -110
-110 ÷ 140 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%