-7.2% is the change from 542 to 503
Calculation steps:
[( 503 - 542 ) ÷ 542] x 100 = -7.2%
Formula
Percentage change = [(503 - 542) / 542] x 100
Subtract the new number by the original number
503 - 542 = -39
-39 ÷ 542 = -0.07195571955719557
-0.07195571955719557 x 100 = -7.2%