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## Sagot :

3. Calculate the total cost by multiplying the number of boxes by the cost per box.

So, the calculation is:

[tex]\[ \text{Total cost} = \text{Number of boxes} \times \text{Cost per box} \][/tex]

[tex]\[ \text{Total cost} = 12 \times 3 \][/tex]

[tex]\[ \text{Total cost} = 36 \][/tex]

Therefore, the total cost of 12 boxes of cookies, each costing [tex]$3, is $[/tex]36.