-22.78% is the change from 439 to 339
Calculation steps:
[( 339 - 439 ) ÷ 439] x 100 = -22.78%
Formula
Percentage change = [(339 - 439) / 439] x 100
Subtract the new number by the original number
339 - 439 = -100
-100 ÷ 439 = -0.22779043280182232
-0.22779043280182232 x 100 = -22.78%