86.41% is the change from 309 to 576
Calculation steps:
[( 576 - 309 ) ÷ 309] x 100 = 86.41%
Formula
Percentage change = [(576 - 309) / 309] x 100
Subtract the new number by the original number
576 - 309 = 267
267 ÷ 309 = 0.8640776699029126
0.8640776699029126 x 100 = 86.41%