-49.4% is the change from 668 to 338
Calculation steps:
[( 338 - 668 ) ÷ 668] x 100 = -49.4%
Formula
Percentage change = [(338 - 668) / 668] x 100
Subtract the new number by the original number
338 - 668 = -330
-330 ÷ 668 = -0.4940119760479042
-0.4940119760479042 x 100 = -49.4%