35.1% is the change from 621 to 839
Calculation steps:
[( 839 - 621 ) ÷ 621] x 100 = 35.1%
Formula
Percentage change = [(839 - 621) / 621] x 100
Subtract the new number by the original number
839 - 621 = 218
218 ÷ 621 = 0.35104669887278583
0.35104669887278583 x 100 = 35.1%