137.21% is the change from 344 to 816
Calculation steps:
[( 816 - 344 ) ÷ 344] x 100 = 137.21%
Formula
Percentage change = [(816 - 344) / 344] x 100
Subtract the new number by the original number
816 - 344 = 472
472 ÷ 344 = 1.372093023255814
1.372093023255814 x 100 = 137.21%