145.29% is the change from 340 to 834
Calculation steps:
[( 834 - 340 ) ÷ 340] x 100 = 145.29%
Formula
Percentage change = [(834 - 340) / 340] x 100
Subtract the new number by the original number
834 - 340 = 494
494 ÷ 340 = 1.4529411764705882
1.4529411764705882 x 100 = 145.29%