The interest rate on a $$15,500$ loan is $9\mathrm{.}9\%$ compounded semiannually. Semiannual payments will pay off the loan in eight years. $($Do not round intermediate calculations. Round the PMT and final answers to $2$ decimal places.$)$

a$.$ Calculate the interest component of Payment $11.$

Interest

$ $$

b$.$ Calculate the principal component of Payment $5.$

Principal $,$$ $$

c$.$ Calculate the interest paid in Year $7.$

Interest paid

$ $$

d$.$ How much do Payments $5$ to $8$ inclusive reduce the principal balance?

Principal reduction

$ $$