-1.45% is the change from 550 to 542
Calculation steps:
[( 542 - 550 ) ÷ 550] x 100 = -1.45%
Formula
Percentage change = [(542 - 550) / 550] x 100
Subtract the new number by the original number
542 - 550 = -8
-8 ÷ 550 = -0.014545454545454545
-0.014545454545454545 x 100 = -1.45%