-79.54% is the change from 391 to 80
Calculation steps:
[( 80 - 391 ) ÷ 391] x 100 = -79.54%
Formula
Percentage change = [(80 - 391) / 391] x 100
Subtract the new number by the original number
80 - 391 = -311
-311 ÷ 391 = -0.7953964194373402
-0.7953964194373402 x 100 = -79.54%