Mickey and Jenny Porter file a joint tax return, and they itemize deductions. The Porters incur $$2,975$ in investment expenses. They also incur $$4,625$ of investment interest expense during the year. The Porters' income for the year consists of $$169,500$ in salary and $$3,865$ of interest income.

a$.$ What is the amount of the Porters' investment interest expense deduction for the year? b$.$What would their investment interest expense deduction be if they also had a $($$$2,455)$ long$-$term capital loss?