-48.53% is the change from 680 to 350
Calculation steps:
[( 350 - 680 ) ÷ 680] x 100 = -48.53%
Formula
Percentage change = [(350 - 680) / 680] x 100
Subtract the new number by the original number
350 - 680 = -330
-330 ÷ 680 = -0.4852941176470588
-0.4852941176470588 x 100 = -48.53%