66.4% is the change from 509 to 847
Calculation steps:
[( 847 - 509 ) ÷ 509] x 100 = 66.4%
Formula
Percentage change = [(847 - 509) / 509] x 100
Subtract the new number by the original number
847 - 509 = 338
338 ÷ 509 = 0.6640471512770137
0.6640471512770137 x 100 = 66.4%