34.51% is the change from 623 to 838
Calculation steps:
[( 838 - 623 ) ÷ 623] x 100 = 34.51%
Formula
Percentage change = [(838 - 623) / 623] x 100
Subtract the new number by the original number
838 - 623 = 215
215 ÷ 623 = 0.3451043338683788
0.3451043338683788 x 100 = 34.51%