$3.$ At a growth $($interest$)$ rate of $7\mathrm{.}8$ percent annually, how long will it take for you to triple your money?

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$4.$ What is the future value of an $$3,095$ annuity payment over $10$ years if the interest rates are $6$ percent?

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$5.$ What is the present value of a $$8,400$ annuity payment over $5$ years if interest rates are $5\mathrm{.}5$ percent?

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