-35% is the change from 140 to 91
Calculation steps:
[( 91 - 140 ) ÷ 140] x 100 = -35%
Formula
Percentage change = [(91 - 140) / 140] x 100
Subtract the new number by the original number
91 - 140 = -49
-49 ÷ 140 = -0.35
-0.35 x 100 = -35%
Example