24.71% is the change from 340 to 424
Calculation steps:
[( 424 - 340 ) ÷ 340] x 100 = 24.71%
Formula
Percentage change = [(424 - 340) / 340] x 100
Subtract the new number by the original number
424 - 340 = 84
84 ÷ 340 = 0.24705882352941178
0.24705882352941178 x 100 = 24.71%