129.41% is the change from 340 to 780
Calculation steps:
[( 780 - 340 ) ÷ 340] x 100 = 129.41%
Formula
Percentage change = [(780 - 340) / 340] x 100
Subtract the new number by the original number
780 - 340 = 440
440 ÷ 340 = 1.2941176470588236
1.2941176470588236 x 100 = 129.41%