55.23% is the change from 306 to 475
Calculation steps:
[( 475 - 306 ) ÷ 306] x 100 = 55.23%
Formula
Percentage change = [(475 - 306) / 306] x 100
Subtract the new number by the original number
475 - 306 = 169
169 ÷ 306 = 0.5522875816993464
0.5522875816993464 x 100 = 55.23%