49.35% is the change from 306 to 457
Calculation steps:
[( 457 - 306 ) ÷ 306] x 100 = 49.35%
Formula
Percentage change = [(457 - 306) / 306] x 100
Subtract the new number by the original number
457 - 306 = 151
151 ÷ 306 = 0.4934640522875817
0.4934640522875817 x 100 = 49.35%