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sales tax question (too long)

the sales tax collected on each sale varies directly as the amount of the sale. What is the constant of varation if a sale tax of $0.63 is collected on a sale of $9.00?
how would u solve this 

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
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Hi Fanny;