Jamshid borrowed $350 from his mother at the beginning of every month for 2 years while

Jamshid borrowed $350 from his mother at the beginning of every month for 2 ½ years while he attended Seneca College.
a. If the interest rate on the accumulating debt was 6% compounded semiannually, what amount did he owe his mother at the end of the 2 ½ -year period?
b. If he made the first monthly payment of $175 on the loan at the end of the first month following the 2 ½ -year period, how long after the date he entered college will he have the loan repaid?