-21.32% is the change from 394 to 310
Calculation steps:
[( 310 - 394 ) ÷ 394] x 100 = -21.32%
Formula
Percentage change = [(310 - 394) / 394] x 100
Subtract the new number by the original number
310 - 394 = -84
-84 ÷ 394 = -0.2131979695431472
-0.2131979695431472 x 100 = -21.32%