-9.5% is the change from 600 to 543
Calculation steps:
[( 543 - 600 ) ÷ 600] x 100 = -9.5%
Formula
Percentage change = [(543 - 600) / 600] x 100
Subtract the new number by the original number
543 - 600 = -57
-57 ÷ 600 = -0.095
-0.095 x 100 = -9.5%
Example