-23.3% is the change from 339 to 260
Calculation steps:
[( 260 - 339 ) ÷ 339] x 100 = -23.3%
Formula
Percentage change = [(260 - 339) / 339] x 100
Subtract the new number by the original number
260 - 339 = -79
-79 ÷ 339 = -0.23303834808259588
-0.23303834808259588 x 100 = -23.3%