54.9% is the change from 306 to 474
Calculation steps:
[( 474 - 306 ) ÷ 306] x 100 = 54.9%
Formula
Percentage change = [(474 - 306) / 306] x 100
Subtract the new number by the original number
474 - 306 = 168
168 ÷ 306 = 0.5490196078431373
0.5490196078431373 x 100 = 54.9%