Question
Rachel wants to buy 19 identical pens as follows.
1 for $3.50
6 for $20.40
What is the least amount of money she needs to buy 19 such pens?
3 m

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Rachel wants to buy 19 identical pens as follows.
1 for $3.50
6 for $20.40
What is the least amount of money she needs to buy 19 such pens?