30.65% is the change from 620 to 810
Calculation steps:
[( 810 - 620 ) ÷ 620] x 100 = 30.65%
Formula
Percentage change = [(810 - 620) / 620] x 100
Subtract the new number by the original number
810 - 620 = 190
190 ÷ 620 = 0.3064516129032258
0.3064516129032258 x 100 = 30.65%