-93.75% is the change from 80 to 5
Calculation steps:
[( 5 - 80 ) ÷ 80] x 100 = -93.75%
Formula
Percentage change = [(5 - 80) / 80] x 100
Subtract the new number by the original number
5 - 80 = -75
-75 ÷ 80 = -0.9375
-0.9375 x 100 = -93.75%
Example