27.11% is the change from 509 to 647
Calculation steps:
[( 647 - 509 ) ÷ 509] x 100 = 27.11%
Formula
Percentage change = [(647 - 509) / 509] x 100
Subtract the new number by the original number
647 - 509 = 138
138 ÷ 509 = 0.27111984282907664
0.27111984282907664 x 100 = 27.11%