68.57% is the change from 509 to 858
Calculation steps:
[( 858 - 509 ) ÷ 509] x 100 = 68.57%
Formula
Percentage change = [(858 - 509) / 509] x 100
Subtract the new number by the original number
858 - 509 = 349
349 ÷ 509 = 0.6856581532416502
0.6856581532416502 x 100 = 68.57%