Final answer:
The PLUS loan will have a higher balance at the time of repayment by $237.40.
Step-by-step explanation:
To determine which loan will have a higher balance at the time of repayment, we need to calculate the future value of each loan. For the unsubsidized Stafford loan, the principal is $9,056, the interest rate is 6.8% compounded monthly, and the loan term is 6 months grace period + 12 months of repayment = 18 months. For the PLUS loan, the principal is the same, but the interest rate is 7.8% compounded monthly, and the loan term is 12 months of repayment. Using the future value formula:
Future Value = Principal * (1 + Interest Rate/12)^Number of Months
For the unsubsidized Stafford loan:
Future Value = $9,056 * (1 + 0.068/12)^(18)
For the PLUS loan:
Future Value = $9,056 * (1 + 0.078/12)^(12)
Calculating these values gives:
For the unsubsidized Stafford loan: $9,056 * (1 + 0.068/12)^(18) = $9,150.59
For the PLUS loan: $9,056 * (1 + 0.078/12)^(12) = $9,237.40
Therefore, the PLUS loan will have a higher balance at the time of repayment, by $237.40.