-88.53% is the change from 340 to 39
Calculation steps:
[( 39 - 340 ) ÷ 340] x 100 = -88.53%
Formula
Percentage change = [(39 - 340) / 340] x 100
Subtract the new number by the original number
39 - 340 = -301
-301 ÷ 340 = -0.8852941176470588
-0.8852941176470588 x 100 = -88.53%