-41.02% is the change from 668 to 394
Calculation steps:
[( 394 - 668 ) ÷ 668] x 100 = -41.02%
Formula
Percentage change = [(394 - 668) / 668] x 100
Subtract the new number by the original number
394 - 668 = -274
-274 ÷ 668 = -0.4101796407185629
-0.4101796407185629 x 100 = -41.02%