-89.97% is the change from 339 to 34
Calculation steps:
[( 34 - 339 ) ÷ 339] x 100 = -89.97%
Formula
Percentage change = [(34 - 339) / 339] x 100
Subtract the new number by the original number
34 - 339 = -305
-305 ÷ 339 = -0.8997050147492626
-0.8997050147492626 x 100 = -89.97%