82.03% is the change from 306 to 557
Calculation steps:
[( 557 - 306 ) ÷ 306] x 100 = 82.03%
Formula
Percentage change = [(557 - 306) / 306] x 100
Subtract the new number by the original number
557 - 306 = 251
251 ÷ 306 = 0.8202614379084967
0.8202614379084967 x 100 = 82.03%