86.44% is the change from 509 to 949
Calculation steps:
[( 949 - 509 ) ÷ 509] x 100 = 86.44%
Formula
Percentage change = [(949 - 509) / 509] x 100
Subtract the new number by the original number
949 - 509 = 440
440 ÷ 509 = 0.8644400785854617
0.8644400785854617 x 100 = 86.44%