-80.45% is the change from 399 to 78
Calculation steps:
[( 78 - 399 ) ÷ 399] x 100 = -80.45%
Formula
Percentage change = [(78 - 399) / 399] x 100
Subtract the new number by the original number
78 - 399 = -321
-321 ÷ 399 = -0.8045112781954887
-0.8045112781954887 x 100 = -80.45%