-20.8% is the change from 399 to 316
Calculation steps:
[( 316 - 399 ) ÷ 399] x 100 = -20.8%
Formula
Percentage change = [(316 - 399) / 399] x 100
Subtract the new number by the original number
316 - 399 = -83
-83 ÷ 399 = -0.20802005012531327
-0.20802005012531327 x 100 = -20.8%