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The problem you shared is about calculating Seth's total deposit over the years and determining how much of his retirement savings comes from interest.

### Key Information:
- **Seth's age when he starts saving**: 36
- **Retirement age**: 65
- **Monthly deposit**: $450
- **Retirement savings at age 65**: $394,910.40

### Step 1: Calculate the total amount deposited
Seth deposits $450 every month for the number of years between 36 and 65.

- Number of years = 65 - 36 = 29 years
- Number of months = 29 years × 12 months/year = 348 months
- Total deposited = 348 months × $450/month = $156,600

### Step 2: Determine the interest earned
The total retirement savings at 65 is $394,910.40. The difference between the total savings and the total deposits is the interest earned.

- Interest earned = $394,910.40 - $156,600 = $238,310.40

### Summary:
- **Total amount deposited by Seth**: $156,600
- **Total interest earned**: $238,310.40

Would you like further details or any clarifications?

Here are 5 related questions to expand on this topic:
1. What would happen if Seth increased his monthly deposit over time?
2. How would the total savings change if Seth started saving at age 30 instead of 36?
3. How does compound interest factor into the final amount in Seth’s IRA?
4. What if Seth withdrew money early; how would that impact his savings and interest?
5. What is the annual interest rate implied in Seth’s retirement savings?

**Tip**: Consistent monthly contributions over a long period benefit greatly from compound interest, which significantly increases the total savings beyond just the initial deposits.

Seth starts an IRA (Individual Retirement Account) at the age of 36 to save for retirement. He deposits $450 each month. Upon retirement at the age of 65, his retirement savings is $394,910.40. Determine the amount of money Seth deposited over the length of the investment and how much he made in interest upon retirement.

Learn how to calculate total retirement savings by determining monthly deposits and interest earned. This problem involves simple arithmetic and interest calculation concepts, ideal for high school students in Grades 9-12.

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