139.24% is the change from 344 to 823
Calculation steps:
[( 823 - 344 ) ÷ 344] x 100 = 139.24%
Formula
Percentage change = [(823 - 344) / 344] x 100
Subtract the new number by the original number
823 - 344 = 479
479 ÷ 344 = 1.3924418604651163
1.3924418604651163 x 100 = 139.24%