33.77% is the change from 228 to 305
Calculation steps:
[( 305 - 228 ) ÷ 228] x 100 = 33.77%
Formula
Percentage change = [(305 - 228) / 228] x 100
Subtract the new number by the original number
305 - 228 = 77
77 ÷ 228 = 0.33771929824561403
0.33771929824561403 x 100 = 33.77%