-47.6% is the change from 668 to 350
Calculation steps:
[( 350 - 668 ) ÷ 668] x 100 = -47.6%
Formula
Percentage change = [(350 - 668) / 668] x 100
Subtract the new number by the original number
350 - 668 = -318
-318 ÷ 668 = -0.47604790419161674
-0.47604790419161674 x 100 = -47.6%