-71.25% is the change from 80 to 23
Calculation steps:
[( 23 - 80 ) ÷ 80] x 100 = -71.25%
Formula
Percentage change = [(23 - 80) / 80] x 100
Subtract the new number by the original number
23 - 80 = -57
-57 ÷ 80 = -0.7125
-0.7125 x 100 = -71.25%
Example