Answer:
Answer: It costs $5.52 to Sean to buy 12 stamps.
Explanation:
Given: Sean paid $8.28 for 18 stamps.
Thus, the cost of 18 stamps = $8.28
Then the cost of 1 stamp=
Thus, the cost of 1 stamp=$0.46
With the same rate , the cost of 12 stamps=
Therefore, the cost of 12 stamps= $5.52
hence, it costs $5.52 to Sean to buy 12 stamps.