-49.26% is the change from 680 to 345
Calculation steps:
[( 345 - 680 ) ÷ 680] x 100 = -49.26%
Formula
Percentage change = [(345 - 680) / 680] x 100
Subtract the new number by the original number
345 - 680 = -335
-335 ÷ 680 = -0.49264705882352944
-0.49264705882352944 x 100 = -49.26%