33.82% is the change from 340 to 455
Calculation steps:
[( 455 - 340 ) ÷ 340] x 100 = 33.82%
Formula
Percentage change = [(455 - 340) / 340] x 100
Subtract the new number by the original number
455 - 340 = 115
115 ÷ 340 = 0.3382352941176471
0.3382352941176471 x 100 = 33.82%