A customer has a savings account for one year. During that year they earn $$65\mathrm{.}50$ in interest. For $180$ days they have $$2000$ in the account for the other $180$ days they have $$1000$ in the account. What is the annual percentage yield on this savings account.

A$)6\mathrm{.}55\%$

B$)3\mathrm{.}28\%$

C$)4\mathrm{.}37\%$

D$)8\mathrm{.}73\%$

E$)$ None of the above

Answer: C