-49.41% is the change from 680 to 344
Calculation steps:
[( 344 - 680 ) ÷ 680] x 100 = -49.41%
Formula
Percentage change = [(344 - 680) / 680] x 100
Subtract the new number by the original number
344 - 680 = -336
-336 ÷ 680 = -0.49411764705882355
-0.49411764705882355 x 100 = -49.41%