Mathematics, 24.04.2020 03:04 lizycacer863

The amount of sales tax charged is directly proportional to the amount of the purchase. Anna pays $3.90 sales tax on a $60 purchase. What is the rate of the sales tax? What would be the sales tax be on a $340 purchase?

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The amount of sales tax charged is directly proportional to the amount of the purchase. Anna pays $3...