To determine the cost for one shirt, we can use the data provided in the table. The total cost and quantity of shirts can be expressed for the different quantities.
Let's calculate the cost per shirt for each quantity:
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For 6 shirts costing $18: Cost per shirt = 18 / 6 = $3
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For 5 shirts costing $15: Cost per shirt = 15 / 5 = $3
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For 4 shirts costing $12: Cost per shirt = 12 / 4 = $3
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For 3 shirts costing $9: Cost per shirt = 9 / 3 = $3
In all cases, the cost for one shirt is consistently $3.
Therefore, the cost for one shirt is $3.