42.3% is the change from 305 to 434
Calculation steps:
[( 434 - 305 ) ÷ 305] x 100 = 42.3%
Formula
Percentage change = [(434 - 305) / 305] x 100
Subtract the new number by the original number
434 - 305 = 129
129 ÷ 305 = 0.42295081967213116
0.42295081967213116 x 100 = 42.3%