Question
The bookstore has a special offer for rulers:

1 ruler for $3.40
2 rulers for $6

Daniel wants to buy 13 rulers. What is the least amount he has to pay?
3 m

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The bookstore has a special offer for rulers:

1 ruler for $3.40
2 rulers for $6

Daniel wants to buy 13 rulers. What is the least amount he has to pay?