36.29% is the change from 609 to 830
Calculation steps:
[( 830 - 609 ) ÷ 609] x 100 = 36.29%
Formula
Percentage change = [(830 - 609) / 609] x 100
Subtract the new number by the original number
830 - 609 = 221
221 ÷ 609 = 0.36288998357963875
0.36288998357963875 x 100 = 36.29%