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An aluminum recycling center pays $0.08 per pound for cans. How much will Mark receive for 21.5 pounds of cans?

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\bf \begin{array}{ccll} \$&\stackrel{cans}{lbs}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 0.08&1\\ x&21.5 \end{array}\implies \cfrac{0.08}{x}=\cfrac{1}{21.5}\implies \cfrac{0.08\cdot 21.5}{1}=x
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