Answer :

[tex]\frac{7}{12}\cdot30=\frac{7}{2}\cdot5=\frac{35}{2}=\$17.5\leftarrow \hbox{ Joseph}\\ 30\%\cdot30=0,3\cdot30=\$9\leftarrow \hbox{ Maria}\\ 30-17.5-9=\$3.5 \leftarrow \hbox{ Rebecca}[/tex]

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