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In order to compute the markup, compute the percentage like this:

The markup is then $12,32.
The selling price is the sum of the cost and the markup:
Answer:
4x - 20
Step-by-step explanation:
Combine like terms (those with the same amount of variables:
x + x + x + x = 4x
4x - 20 => Note: You cannot combine these two terms, because they do not have the same amount of variables (one having one variable (x), the other being a constant (no variable) ).
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