Question
Christopher wants to buy 13 identical staplers as follows.
1 for $4.80
6 for $21.50
What is the least amount of money she needs to buy 13 such staplers?
3 m

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Christopher wants to buy 13 identical staplers as follows.
1 for $4.80
6 for $21.50
What is the least amount of money she needs to buy 13 such staplers?