-79.9% is the change from 398 to 80
Calculation steps:
[( 80 - 398 ) ÷ 398] x 100 = -79.9%
Formula
Percentage change = [(80 - 398) / 398] x 100
Subtract the new number by the original number
80 - 398 = -318
-318 ÷ 398 = -0.7989949748743719
-0.7989949748743719 x 100 = -79.9%