Stephanie gets a small business loan for $$75,000$ to start her hair salon. She will repay the loan with equal monthly payments over $5$ years at $8\mathrm{.}4\%$ per year, compounded monthly.

a$)$ What is Stephanie's monthly loan payment? $($Blank $1)$

b$)$ What is the total amount Stephanie repays? $($Blank $2)$

c$)$ How much of the amount repaid is interest? $($Blank $3)$