Mitchell travels from the US to Canada, where he exchanges 150 US dollars for Canadian dollars. He then spends 20 Canadian dollars, returns to the US, and exchanges the remaining money back to US dollars. How many US dollars does Mitchell have remaining?

129.46
130.00
130.66
134.59

To solve this problem, we'll go through the following steps:

1. **Exchange USD to CAD**: Find out how much CAD Mitchell gets for his 150 USD.
2. **Calculate spending in CAD**: Subtract the amount he spends in CAD.
3. **Exchange remaining CAD back to USD**: Find out how much USD he gets back after spending.

However, the problem statement doesn't provide the exchange rates, so let's assume the choices provided are the different possible answers.

1. **129.46**: This amount suggests that after converting his remaining CAD back to USD, Mitchell would have 129.46 USD.
2. **130.00**: This suggests an even conversion to USD, possibly a rounded amount.
3. **130.66**: This indicates a slightly higher conversion rate back to USD.
4. **134.59**: This is the highest amount, suggesting the most favorable exchange rate back to USD.

Given that without specific exchange rates, we can make a reasonable assumption based on typical exchange rates and conversions:

- **The lowest possible remaining amount (129.46 USD)** suggests a less favorable exchange rate back to USD.
- **The highest possible remaining amount (134.59 USD)** suggests a more favorable exchange rate back to USD.

Since Mitchell spent 20 CAD and then converted the remaining amount back to USD, the most plausible final amount, assuming standard exchange rates and typical conversion losses, would likely be slightly above the amount spent. Thus, the answer **134.59 USD** seems the most reasonable as it suggests a favorable exchange back to USD with minimal loss or even a slight gain.

**Final Answer: 134.59 USD**

Would you like more details on currency conversions, or have any other questions? 

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**Relative Questions:**

1. What factors influence the exchange rate between two currencies?
2. How can fluctuations in exchange rates affect international travel costs?
3. What are the typical fees associated with currency exchange?
4. How can one get the best exchange rate when traveling?
5. What is the concept of currency arbitrage?
6. How do central banks influence exchange rates?
7. What is the difference between spot rates and forward rates in currency exchange?
8. How can you protect yourself from unfavorable exchange rate changes?

**Tip**: Always compare exchange rates and fees at different vendors before exchanging currency, as they can vary significantly.

Explore Mitchell's currency exchange problem where he converts USD to CAD, spends some CAD, and converts the remaining back to USD. Understand the calculations involved and how exchange rates impact final amounts. Suitable for advanced high school students.

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