33.61% is the change from 610 to 815
Calculation steps:
[( 815 - 610 ) ÷ 610] x 100 = 33.61%
Formula
Percentage change = [(815 - 610) / 610] x 100
Subtract the new number by the original number
815 - 610 = 205
205 ÷ 610 = 0.3360655737704918
0.3360655737704918 x 100 = 33.61%