9.43% is the change from 509 to 557
Calculation steps:
[( 557 - 509 ) ÷ 509] x 100 = 9.43%
Formula
Percentage change = [(557 - 509) / 509] x 100
Subtract the new number by the original number
557 - 509 = 48
48 ÷ 509 = 0.09430255402750491
0.09430255402750491 x 100 = 9.43%