9.86% is the change from 507 to 557
Calculation steps:
[( 557 - 507 ) ÷ 507] x 100 = 9.86%
Formula
Percentage change = [(557 - 507) / 507] x 100
Subtract the new number by the original number
557 - 507 = 50
50 ÷ 507 = 0.09861932938856016
0.09861932938856016 x 100 = 9.86%