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Part $1$

You are $24$ years old and decide to start saving for your retirement. You plan to save $$$$4$ comma $000$ at the end of each year$($so the first deposit will be one year from$$ now$),$ and will make the last deposit when you retire at age $70.$ Suppose you earn $7\%$ per year on your retirement savings.

a$.$ How much will you have saved for$$ retirement?

b$.$ How much will you have saved if you wait until age $31$ to start saving$($again$,$ with your first deposit at the end of the$$ year$)?$