138.53% is the change from 340 to 811
Calculation steps:
[( 811 - 340 ) ÷ 340] x 100 = 138.53%
Formula
Percentage change = [(811 - 340) / 340] x 100
Subtract the new number by the original number
811 - 340 = 471
471 ÷ 340 = 1.3852941176470588
1.3852941176470588 x 100 = 138.53%