34.21% is the change from 228 to 306
Calculation steps:
[( 306 - 228 ) ÷ 228] x 100 = 34.21%
Formula
Percentage change = [(306 - 228) / 228] x 100
Subtract the new number by the original number
306 - 228 = 78
78 ÷ 228 = 0.34210526315789475
0.34210526315789475 x 100 = 34.21%