A \(\$64\) backpack has \(7.5\%\) sales tax. Consider these methods: A, find \(7.5\%~\text{of}~64\) and add it; B, find \(64\%~\text{of}~7.5\); C, subtract \(7.5\%\); D, multiply \(64\) by \(7.5\). Choose the method that works, then calculate the total cost.
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What this problem is really about
A valid sales-tax method applies the rate to the original sixty-four-dollar price and then adds the tax because the question asks for total cost. We’ll identify the method with that structure, convert seven point five percent to a decimal, calculate the tax, and add it. Subtracting the original price from the total checks the intermediate charge.
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