144.41% is the change from 340 to 831
Calculation steps:
[( 831 - 340 ) ÷ 340] x 100 = 144.41%
Formula
Percentage change = [(831 - 340) / 340] x 100
Subtract the new number by the original number
831 - 340 = 491
491 ÷ 340 = 1.4441176470588235
1.4441176470588235 x 100 = 144.41%