-79.7% is the change from 394 to 80
Calculation steps:
[( 80 - 394 ) ÷ 394] x 100 = -79.7%
Formula
Percentage change = [(80 - 394) / 394] x 100
Subtract the new number by the original number
80 - 394 = -314
-314 ÷ 394 = -0.7969543147208121
-0.7969543147208121 x 100 = -79.7%