34.65% is the change from 609 to 820
Calculation steps:
[( 820 - 609 ) ÷ 609] x 100 = 34.65%
Formula
Percentage change = [(820 - 609) / 609] x 100
Subtract the new number by the original number
820 - 609 = 211
211 ÷ 609 = 0.3464696223316913
0.3464696223316913 x 100 = 34.65%