Question $4(8$ points$)$

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You want to invest in an annuity that will pay you $$860$ per montK for the first $7$ years and $$160$ per week for the last $3$ years. If the Jannuity earns $7\mathrm{.}8\%$ compounded monthly for the first $7$ years and $7\mathrm{.}7\%$ compounded weekly for the remaining $3$ years, what would be the amount of your initial investment?

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