34.41% is the change from 340 to 457
Calculation steps:
[( 457 - 340 ) ÷ 340] x 100 = 34.41%
Formula
Percentage change = [(457 - 340) / 340] x 100
Subtract the new number by the original number
457 - 340 = 117
117 ÷ 340 = 0.34411764705882353
0.34411764705882353 x 100 = 34.41%