Question
A book shop sells either one file for $3 or in packs of 6 for $11. Min wants to buy exactly 27 files with the smallest amount of money. How much does she have to pay for the 27 files?
3 m

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A book shop sells either one file for $3 or in packs of 6 for $11. Min wants to buy exactly 27 files with the smallest amount of money. How much does she have to pay for the 27 files?