2.77% is the change from 542 to 557
Calculation steps:
[( 557 - 542 ) ÷ 542] x 100 = 2.77%
Formula
Percentage change = [(557 - 542) / 542] x 100
Subtract the new number by the original number
557 - 542 = 15
15 ÷ 542 = 0.027675276752767528
0.027675276752767528 x 100 = 2.77%