-30.49% is the change from 328 to 228
Calculation steps:
[( 228 - 328 ) ÷ 328] x 100 = -30.49%
Formula
Percentage change = [(228 - 328) / 328] x 100
Subtract the new number by the original number
228 - 328 = -100
-100 ÷ 328 = -0.3048780487804878
-0.3048780487804878 x 100 = -30.49%