Final answer:
To calculate the future value of the investment, use the formula for compound interest: Future Value = Present Value * (1 + Interest Rate)^Number of Periods. In this case, the Present Value is $4,000, the Interest Rate is 9%, and the Number of Periods is 30 years (or 30*52 weeks).
Step-by-step explanation:
To calculate the future value of the investment, we can use the formula for compound interest:
Future Value = Present Value * (1 + Interest Rate)^Number of Periods.
In this case, the Present Value is $4,000 (which is the weekly savings), the Interest Rate is 9% (or 0.09), and the Number of Periods is 30 years (or 30*52 weeks).
So, the future value of the investment at age 65 would be:
Future Value = $4,000 * (1 + 0.09)^(30 * 52)