-21.86% is the change from 398 to 311
Calculation steps:
[( 311 - 398 ) ÷ 398] x 100 = -21.86%
Formula
Percentage change = [(311 - 398) / 398] x 100
Subtract the new number by the original number
311 - 398 = -87
-87 ÷ 398 = -0.2185929648241206
-0.2185929648241206 x 100 = -21.86%