a. You purchase a stock for $9,000 and collect $300 at the end of each year in dividends. You sell the stock for $10,500 after five years. What was the annual return on your $9,000 investment?   

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b. You purchase a building for $850,000, collect annual rent (after expenses) of $110,000, and sell the building for $950,000 after seven years. What is the annual return on this investment?