31.61% is the change from 620 to 816
Calculation steps:
[( 816 - 620 ) ÷ 620] x 100 = 31.61%
Formula
Percentage change = [(816 - 620) / 620] x 100
Subtract the new number by the original number
816 - 620 = 196
196 ÷ 620 = 0.3161290322580645
0.3161290322580645 x 100 = 31.61%