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If the crate costs $30 and he wants to make a profit of $110, the total selling value (Income) should be:
[tex]\begin{gathered} \text{Profit}=\text{Income}-\text{Expense} \\ 110=\text{Income}-30 \\ \text{Income}=110+30=140 \end{gathered}[/tex]Then, if the crate contains 40 blank CD's, in order to find the unitary price of each CD, we can divide the total Income by the number of CD's:
[tex]\text{price}=\frac{140}{40}=3.5[/tex]So each CD's should cost $3.50.