Question
Alexander wants to buy 13 identical markers as follows.
1 for $3.70
6 for $21.70
What is the least amount of money she needs to buy 13 such markers?
3 m

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Alexander wants to buy 13 identical markers as follows.
1 for $3.70
6 for $21.70
What is the least amount of money she needs to buy 13 such markers?