80.58% is the change from 309 to 558
Calculation steps:
[( 558 - 309 ) ÷ 309] x 100 = 80.58%
Formula
Percentage change = [(558 - 309) / 309] x 100
Subtract the new number by the original number
558 - 309 = 249
249 ÷ 309 = 0.8058252427184466
0.8058252427184466 x 100 = 80.58%