Given that each slack is purchased at $19.16, so the cost price is $19.16
Also given that each slack is marked at $22.43, so the marked price is $22.43
It is asked to use the formula,
[tex]S=C+M[/tex]Substitute the values and simplify,
[tex]S=19.16+22.43=41.59[/tex]Thus, the selling price of each pair os slacks is $41.59