In the given formula
C is the cost, M is the markup, and S is the selling price of each pair of slack.
According to the statement we have:
• C = cost = $18.66,
,
• M = markup = $23.33.
Replacing these values in the formula of S, the selling price, we get:
S = $18.66 + $23.33 = $41.99.
Answer
The selling price of each pair of slacks is $41.99.