63.26% is the change from 509 to 831
Calculation steps:
[( 831 - 509 ) ÷ 509] x 100 = 63.26%
Formula
Percentage change = [(831 - 509) / 509] x 100
Subtract the new number by the original number
831 - 509 = 322
322 ÷ 509 = 0.6326129666011788
0.6326129666011788 x 100 = 63.26%