87.38% is the change from 309 to 579
Calculation steps:
[( 579 - 309 ) ÷ 309] x 100 = 87.38%
Formula
Percentage change = [(579 - 309) / 309] x 100
Subtract the new number by the original number
579 - 309 = 270
270 ÷ 309 = 0.8737864077669902
0.8737864077669902 x 100 = 87.38%