Cynthia saved $$100$ at the end of every month for $5$ years in his bank account that earned $2\mathrm{.}10\%$ compounded monthly.

a$.$ What is the accumulated value of his savings at the end of the period?

$$6,209\mathrm{.}63$

$$6,320\mathrm{.}50$

$$120,495\mathrm{.}34$

$$320\mathrm{.}50$

b$.$ What is the interest earned over the period?