70.14% is the change from 509 to 866
Calculation steps:
[( 866 - 509 ) ÷ 509] x 100 = 70.14%
Formula
Percentage change = [(866 - 509) / 509] x 100
Subtract the new number by the original number
866 - 509 = 357
357 ÷ 509 = 0.7013752455795678
0.7013752455795678 x 100 = 70.14%