-65% is the change from 80 to 28
Calculation steps:
[( 28 - 80 ) ÷ 80] x 100 = -65%
Formula
Percentage change = [(28 - 80) / 80] x 100
Subtract the new number by the original number
28 - 80 = -52
-52 ÷ 80 = -0.65
-0.65 x 100 = -65%
Example