70.23% is the change from 299 to 509
Calculation steps:
[( 509 - 299 ) ÷ 299] x 100 = 70.23%
Formula
Percentage change = [(509 - 299) / 299] x 100
Subtract the new number by the original number
509 - 299 = 210
210 ÷ 299 = 0.7023411371237458
0.7023411371237458 x 100 = 70.23%