34.12% is the change from 340 to 456
Calculation steps:
[( 456 - 340 ) ÷ 340] x 100 = 34.12%
Formula
Percentage change = [(456 - 340) / 340] x 100
Subtract the new number by the original number
456 - 340 = 116
116 ÷ 340 = 0.3411764705882353
0.3411764705882353 x 100 = 34.12%