88.03% is the change from 309 to 581
Calculation steps:
[( 581 - 309 ) ÷ 309] x 100 = 88.03%
Formula
Percentage change = [(581 - 309) / 309] x 100
Subtract the new number by the original number
581 - 309 = 272
272 ÷ 309 = 0.8802588996763754
0.8802588996763754 x 100 = 88.03%