-20.06% is the change from 339 to 271
Calculation steps:
[( 271 - 339 ) ÷ 339] x 100 = -20.06%
Formula
Percentage change = [(271 - 339) / 339] x 100
Subtract the new number by the original number
271 - 339 = -68
-68 ÷ 339 = -0.20058997050147492
-0.20058997050147492 x 100 = -20.06%