ATB Financial issued a loan of $$73,000$ at $5\mathrm{.}51\%$ compounded semi$-$annually. The loan was repaid by payments of $$790$ at the end of every month.

a$.$ How many payments were required to pay off the loan?

$($Enter a whole number$)$

b$.$ What was the total interest paid in the $8$th year?

$($Enter starting and ending periods as P$1$ and P$2$ and the total interest paid as a positive value to the nearest cent.$)$

$P1=,P2=$

Total interest paid in the $8$ th year $=$$

c$.$ What was the size of the final payment?

$($Enter a positive value to the nearest cent$)$

$