-25.49% is the change from 306 to 228
Calculation steps:
[( 228 - 306 ) ÷ 306] x 100 = -25.49%
Formula
Percentage change = [(228 - 306) / 306] x 100
Subtract the new number by the original number
228 - 306 = -78
-78 ÷ 306 = -0.2549019607843137
-0.2549019607843137 x 100 = -25.49%