29.72% is the change from 646 to 838
Calculation steps:
[( 838 - 646 ) ÷ 646] x 100 = 29.72%
Formula
Percentage change = [(838 - 646) / 646] x 100
Subtract the new number by the original number
838 - 646 = 192
192 ÷ 646 = 0.29721362229102166
0.29721362229102166 x 100 = 29.72%