26.32% is the change from 646 to 816
Calculation steps:
[( 816 - 646 ) ÷ 646] x 100 = 26.32%
Formula
Percentage change = [(816 - 646) / 646] x 100
Subtract the new number by the original number
816 - 646 = 170
170 ÷ 646 = 0.2631578947368421
0.2631578947368421 x 100 = 26.32%