84.48% is the change from 509 to 939
Calculation steps:
[( 939 - 509 ) ÷ 509] x 100 = 84.48%
Formula
Percentage change = [(939 - 509) / 509] x 100
Subtract the new number by the original number
939 - 509 = 430
430 ÷ 509 = 0.8447937131630648
0.8447937131630648 x 100 = 84.48%