35% is the change from 600 to 810
Calculation steps:
[( 810 - 600 ) ÷ 600] x 100 = 35%
Formula
Percentage change = [(810 - 600) / 600] x 100
Subtract the new number by the original number
810 - 600 = 210
210 ÷ 600 = 0.35
0.35 x 100 = 35%
Example