You've graduated with a student loan balance of $$30,000.$ You have up to $10$ years to pay for this loan and will make monthly payments it the interest rate on the loans is $6\mathrm{.}8\%,$ what will your monthly payments be$?$

A$.$ $$323\mathrm{.}47$

B$.$ $$339\mathrm{.}26$

C$.$ $$345\mathrm{.}24$

D$.$ $$357\mathrm{.}56$