Final answer:
The total value of unredeemed gift cards as of August 31 is $300.
Step-by-step explanation:
To find the total value of gift cards that were not redeemed as of August 31, we need to subtract the total amount redeemed from the total amount sold. Given that Marty's Ice Cream Shop sold gift cards for $5,000, and customers redeemed $1,200 in June, $2,100 in July, and $1,400 in August, we can calculate the total value of unredeemed gift cards.
Total value of gift cards sold = $5,000
Total value of gift cards redeemed = $1,200 + $2,100 + $1,400 = $4,700
Total value of unredeemed gift cards = $5,000 - $4,700 = $300
Therefore, the correct answer is option 1) $300.