12.28% is the change from 228 to 256
Calculation steps:
[( 256 - 228 ) ÷ 228] x 100 = 12.28%
Formula
Percentage change = [(256 - 228) / 228] x 100
Subtract the new number by the original number
256 - 228 = 28
28 ÷ 228 = 0.12280701754385964
0.12280701754385964 x 100 = 12.28%