-70% is the change from 140 to 42
Calculation steps:
[( 42 - 140 ) ÷ 140] x 100 = -70%
Formula
Percentage change = [(42 - 140) / 140] x 100
Subtract the new number by the original number
42 - 140 = -98
-98 ÷ 140 = -0.7
-0.7 x 100 = -70%
Example