143.7% is the change from 341 to 831
Calculation steps:
[( 831 - 341 ) ÷ 341] x 100 = 143.7%
Formula
Percentage change = [(831 - 341) / 341] x 100
Subtract the new number by the original number
831 - 341 = 490
490 ÷ 341 = 1.436950146627566
1.436950146627566 x 100 = 143.7%