Question
Risa wants to buy 19 identical pens as follows.
1 for $4.80
6 for $20.50
What is the least amount of money she needs to buy 19 such pens?
3 m

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Risa wants to buy 19 identical pens as follows.
1 for $4.80
6 for $20.50
What is the least amount of money she needs to buy 19 such pens?