34.65% is the change from 228 to 307
Calculation steps:
[( 307 - 228 ) ÷ 228] x 100 = 34.65%
Formula
Percentage change = [(307 - 228) / 228] x 100
Subtract the new number by the original number
307 - 228 = 79
79 ÷ 228 = 0.34649122807017546
0.34649122807017546 x 100 = 34.65%