$($a$)$ Company X has been offered the rates shown in Table $7\mathrm{.}4.$ It can invest for four years at $2\mathrm{.}8\%.$ What floating rate can it swap this fixed rate into?

$($b$)$ Company Y has been offered the rates shown in Table $7\mathrm{.}4.$ It is confident that it will be able to invest at LIBOR minus $50$ basis points for the next ten years. What fixed rate can it swap this floating rate into?