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Please write the explanation thanks

Please write the explanation thanks-example-1

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(7)/(12)\cdot30=(7)/(2)\cdot5=(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}
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