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Question

The table shows the prices of items at a used book. movie, and music store.

 Item  Price  Paperback $4.50 Hard cover $8.00DVD$9.50CD$7.00\begin{array} { | c | c | } \hline \text { Item } & { \text { Price } } \\ \hline \text { Paperback } & { \$ 4.50 } \\ \hline \text { Hard cover } & { \$ 8.00 } \\ \hline D V D & { \$ 9.50 } \\ \hline C D & { \$ 7.00 } \\ \hline \end{array}

Michael has a $30 gift card. He used it to buy 2 DVDs and a hard cover book. What percent of the amount on the gift card did Michael spend?

Solution

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Determine first the total amount of what Michael bought:

9.50×2+8.00=$27\begin{gather*} 9.50 \times 2 + 8.00 = \boldsymbol{\$27} \end{gather*}

In order to determine the percent of the amount on the gift card already spend, divide the total amount spend by the amount of the gift card, then convert it to percent.

27÷30=0.90.9×100=90%\begin{gather*} 27 \div 30 = 0.9\\ 0.9 \times 100 = \boldsymbol{90\%} \end{gather*}

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