-24.48% is the change from 339 to 256
Calculation steps:
[( 256 - 339 ) ÷ 339] x 100 = -24.48%
Formula
Percentage change = [(256 - 339) / 339] x 100
Subtract the new number by the original number
256 - 339 = -83
-83 ÷ 339 = -0.2448377581120944
-0.2448377581120944 x 100 = -24.48%