Question
The stationery kiosk has a special offer for post-it-pads:

1 post-it-pad for $2.40
2 post-it-pads for $4

Riordan wants to buy 9 post-it-pads. What is the least amount he has to pay?
3 m

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The stationery kiosk has a special offer for post-it-pads:

1 post-it-pad for $2.40
2 post-it-pads for $4

Riordan wants to buy 9 post-it-pads. What is the least amount he has to pay?