49.51% is the change from 305 to 456
Calculation steps:
[( 456 - 305 ) ÷ 305] x 100 = 49.51%
Formula
Percentage change = [(456 - 305) / 305] x 100
Subtract the new number by the original number
456 - 305 = 151
151 ÷ 305 = 0.49508196721311476
0.49508196721311476 x 100 = 49.51%