-12.2% is the change from 328 to 288
Calculation steps:
[( 288 - 328 ) ÷ 328] x 100 = -12.2%
Formula
Percentage change = [(288 - 328) / 328] x 100
Subtract the new number by the original number
288 - 328 = -40
-40 ÷ 328 = -0.12195121951219512
-0.12195121951219512 x 100 = -12.2%