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6. You would need to replace the roof your house 20 years from now at an estimated cost of $15,000. How much should you save today to be able to replace your roof. Your investment account earns 10 percent annual return compounded monthly. 7. The loan shark is charging you 0.25 percent interest daily. If you borrowed $5,000, how much will you owe at the end of three years. Assume that no other payments are made and that one year has 365 days on average