-49.93% is the change from 679 to 340
Calculation steps:
[( 340 - 679 ) ÷ 679] x 100 = -49.93%
Formula
Percentage change = [(340 - 679) / 679] x 100
Subtract the new number by the original number
340 - 679 = -339
-339 ÷ 679 = -0.4992636229749632
-0.4992636229749632 x 100 = -49.93%