please be detailed.

Consider the borrowing costs in USD faced by the following three companies: Assume that if any two companies enter the swap transaction, they split the possible savings equally. a) Company B and company C want to engage in the swap transaction. Find the range for the swap rate within which both companies would benefit from the swap? b) Suppose company B wants to borrow fixed-rate funds. Is it possible for B to reduce its cost of borrowing below 4.9%, and if so, what is the lowest possible cost it could achieve? c) Suppose company B wants to borrow floating-rate funds. Is it possible for B to reduce its cost of borrowing below LIBOR +1.7%, and if so, what is the lowest possible cost it could achieve