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A customer purchased 3 bottles of nail polish for a total of $7.80. How much does a salesperson earn on this sale if the commission rate is 39%

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\begin{gathered} 3\cdot7.80=23.4 \\ 23.4\text{ would be total} \\ 23.4\cdot39(\text{percent)}=9.126 \\ 9.126\text{ would be the commission } \end{gathered}

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