34.43% is the change from 610 to 820
Calculation steps:
[( 820 - 610 ) ÷ 610] x 100 = 34.43%
Formula
Percentage change = [(820 - 610) / 610] x 100
Subtract the new number by the original number
820 - 610 = 210
210 ÷ 610 = 0.3442622950819672
0.3442622950819672 x 100 = 34.43%