142.69% is the change from 342 to 830
Calculation steps:
[( 830 - 342 ) ÷ 342] x 100 = 142.69%
Formula
Percentage change = [(830 - 342) / 342] x 100
Subtract the new number by the original number
830 - 342 = 488
488 ÷ 342 = 1.4269005847953216
1.4269005847953216 x 100 = 142.69%