Answer :

Final answer:

The answer is 3240 pens.


Explanation:

To find the total number of pens Tina bought, you multiply the number of boxes by the pens in each box:

36 boxes x 90 pens/box = 3240 pens

Therefore, Tina bought 3240 pens in total.


Learn more about Calculating the total number of items in a purchase here:

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