DATAfile: What is the total amount $($in dollars$)$ of state sales taxes collected from these $279$ purchases?

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$($b$)$ What proportion of these purchases had to pay sales tax? $($Round your answer to four decimal places.$)$

$($c$)$ What is the total amount $($in dollars$)$ of these purchases $($including any sales tax$)?$ Use the rounded sales tax values calculated in part $($a$)$ to find the total.

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Enter a number.

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