-79.85% is the change from 397 to 80
Calculation steps:
[( 80 - 397 ) ÷ 397] x 100 = -79.85%
Formula
Percentage change = [(80 - 397) / 397] x 100
Subtract the new number by the original number
80 - 397 = -317
-317 ÷ 397 = -0.7984886649874056
-0.7984886649874056 x 100 = -79.85%