Suppose that you have opened a saving account with an initial deposit of $5,600. The account offers an annual interest rate of 7.5% compounded weekly. (a) What will be the value of the investment after 15 years? (b) How long it will take for the investment to reach a value of $7,800? (c) What should be the annual interest rate so that the worth value of the investment reaches $7,000 in only 10 years?

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