69.74% is the change from 509 to 864
Calculation steps:
[( 864 - 509 ) ÷ 509] x 100 = 69.74%
Formula
Percentage change = [(864 - 509) / 509] x 100
Subtract the new number by the original number
864 - 509 = 355
355 ÷ 509 = 0.6974459724950884
0.6974459724950884 x 100 = 69.74%