65.82% is the change from 509 to 844
Calculation steps:
[( 844 - 509 ) ÷ 509] x 100 = 65.82%
Formula
Percentage change = [(844 - 509) / 509] x 100
Subtract the new number by the original number
844 - 509 = 335
335 ÷ 509 = 0.6581532416502947
0.6581532416502947 x 100 = 65.82%