Find the following Present Values $($PVs$),$ as of October $1,2017$

a$)$ The PV of $$14300$ due on September $30,2018$ at $8\mathrm{.}75\%$ interest.

b$)$ The PV of $$12500$ due on September $1,2019$ at $4\mathrm{.}2\%$ interest.