31.58% is the change from 646 to 850
Calculation steps:
[( 850 - 646 ) ÷ 646] x 100 = 31.58%
Formula
Percentage change = [(850 - 646) / 646] x 100
Subtract the new number by the original number
850 - 646 = 204
204 ÷ 646 = 0.3157894736842105
0.3157894736842105 x 100 = 31.58%