Question
A kiosk sells either one file for $3 or in packs of 5 for $12. Julie wants to buy exactly 42 files with the smallest amount of money. How much does she have to pay for the 42 files?
3 m

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A kiosk sells either one file for $3 or in packs of 5 for $12. Julie wants to buy exactly 42 files with the smallest amount of money. How much does she have to pay for the 42 files?