33.82% is the change from 621 to 831
Calculation steps:
[( 831 - 621 ) ÷ 621] x 100 = 33.82%
Formula
Percentage change = [(831 - 621) / 621] x 100
Subtract the new number by the original number
831 - 621 = 210
210 ÷ 621 = 0.33816425120772947
0.33816425120772947 x 100 = 33.82%