Peter Piper has applied for a mortgage of $$123,000.$ Interest is computed at $8\mathrm{.}5$ percent compounded semiannually. The mortgage will be paid off over $20$ years. $($For all requirements, use a Financial calculator to arrive at the answers. Do not round intermediate calculations and Round the final answers to $2$ decimal places.$)$

a$.$ Calculate Peter$$s monthly payment.

Monthly payment $

b$.$ Calculate Peter$$s weekly payment.

Weekly payment $

c$.$ Calculate Peter$$s biweekly $($every $2$nd week$)$ payment.

Biweekly payment $