-15.04% is the change from 339 to 288
Calculation steps:
[( 288 - 339 ) ÷ 339] x 100 = -15.04%
Formula
Percentage change = [(288 - 339) / 339] x 100
Subtract the new number by the original number
288 - 339 = -51
-51 ÷ 339 = -0.1504424778761062
-0.1504424778761062 x 100 = -15.04%