Answer: 107
Explanation:
To find out how many stamps Michaela can purchase with $30 if each stamp costs $0.28, you need to divide the total amount of money by the cost of each stamp:
Number of stamps = Total money / Cost per stamp
Number of stamps = $30 / $0.28 ≈ 107.14
Since you can't have a fraction of a stamp, Michaela can purchase 107 stamps with $30, and she would have a little money left over.