-80.6% is the change from 397 to 77
Calculation steps:
[( 77 - 397 ) ÷ 397] x 100 = -80.6%
Formula
Percentage change = [(77 - 397) / 397] x 100
Subtract the new number by the original number
77 - 397 = -320
-320 ÷ 397 = -0.8060453400503779
-0.8060453400503779 x 100 = -80.6%