34.68% is the change from 620 to 835
Calculation steps:
[( 835 - 620 ) ÷ 620] x 100 = 34.68%
Formula
Percentage change = [(835 - 620) / 620] x 100
Subtract the new number by the original number
835 - 620 = 215
215 ÷ 620 = 0.3467741935483871
0.3467741935483871 x 100 = 34.68%