Mark invested $$1,700$ at the beginning of every $6$ months in an RRSP for $11$ years. For the first $8$ years it earned interest at a rate of $3\mathrm{.}40\%$ compounded semi$-$annually and for the next $3$ years it earned interest at a rate of $6\mathrm{.}50\%$ compounded semi$-$annually.

a$.$ Calculate the accumulated value of her investment at the end of the first $8$ years.

$$49,211\mathrm{.}44$

$$49,571\mathrm{.}07$

$$30,958\mathrm{.}97$

$$31,485\mathrm{.}27$

b$.$ Calculate the accumulated value of her investment at the end of $11$ years.

$$49,211\mathrm{.}44$

$$49,571\mathrm{.}07$

$$42,910\mathrm{.}45$

$$31,485\mathrm{.}27$

c$.$ Calculate the amount of interest earned from the investment.

$$12,171\mathrm{.}07$

$$11,811\mathrm{.}44$

$$10,945\mathrm{.}89$

$$1,225\mathrm{.}18$