Calculating Total Cost with Sales Tax Using a Double Number Line

What is the purpose of using a double number line in calculating sales tax?

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Describe the relationship between percentages and decimals as shown in the lesson.

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What steps does Megan take to shade the double number line for her calculations?

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How does Megan calculate 10% of the cost of the computer?

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Explain how Megan arrives at the total cost of her computer after adding sales tax.

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What algebraic expression can Megan use to find the total cost if she does not know the price of the computer?

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How can the sales tax be represented as a decimal, and how does it affect the total cost?

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