Question
The stationery shop has a special offer for files:

1 file for $3.40
2 files for $6

Tommy wants to buy 11 files. What is the least amount he has to pay?
3 m

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The stationery shop has a special offer for files:

1 file for $3.40
2 files for $6

Tommy wants to buy 11 files. What is the least amount he has to pay?