75% is the change from 80 to 140
Calculation steps:
[( 140 - 80 ) ÷ 80] x 100 = 75%
Formula
Percentage change = [(140 - 80) / 80] x 100
Subtract the new number by the original number
140 - 80 = 60
60 ÷ 80 = 0.75
0.75 x 100 = 75%
Example