138.11% is the change from 349 to 831
Calculation steps:
[( 831 - 349 ) ÷ 349] x 100 = 138.11%
Formula
Percentage change = [(831 - 349) / 349] x 100
Subtract the new number by the original number
831 - 349 = 482
482 ÷ 349 = 1.3810888252148996
1.3810888252148996 x 100 = 138.11%