Answer:
The favorable swap between A and B will be:
A borrows fixed a 7.5%, received 7.5% from swap dealer to settle for interest expenses and pay Prime + 0.75% to swap dealer. Thus, the net result is A borrows at variable Prime + 0.75%. A will be benefit from borrowing at variable rate at 0.25% lower.
B borrows at variable Prime + 0.5%, received Prime + 0.5% from swap dealer to settle for interest expenses and pay 7.75% to swap dealer. Thus, net result is B borrows at fixed 7.75%. B will be benefit from borrowing at fixed rate at 0.25% lower.
Money dealer receive from A Prime + 0.75%, from B 7.75%; and paid to A 7.5%, to B Prime + 0.5%. Thus they gain:
Prime + 0.75% + 7.75% - 7.5% - Prime - 0.5% = 0.5%.
Explanation: