31.86% is the change from 339 to 447
Calculation steps:
[( 447 - 339 ) ÷ 339] x 100 = 31.86%
Formula
Percentage change = [(447 - 339) / 339] x 100
Subtract the new number by the original number
447 - 339 = 108
108 ÷ 339 = 0.3185840707964602
0.3185840707964602 x 100 = 31.86%