138.51% is the change from 348 to 830
Calculation steps:
[( 830 - 348 ) ÷ 348] x 100 = 138.51%
Formula
Percentage change = [(830 - 348) / 348] x 100
Subtract the new number by the original number
830 - 348 = 482
482 ÷ 348 = 1.3850574712643677
1.3850574712643677 x 100 = 138.51%