144.19% is the change from 344 to 840
Calculation steps:
[( 840 - 344 ) ÷ 344] x 100 = 144.19%
Formula
Percentage change = [(840 - 344) / 344] x 100
Subtract the new number by the original number
840 - 344 = 496
496 ÷ 344 = 1.441860465116279
1.441860465116279 x 100 = 144.19%