need help with this practice question.

Look at the two tables below. What is the total surplus if Bob buys a unit from Carlos? If Barb buys a unit from Courtney? If Bob buys a unit from Chad? If you match up pairs of buyers and sellers so as to maximize the total surplus of all transactions, what is the largest total surplus that can be achieved? Person Maximum Price Willing to Pay Person Minimum Acceptable Price Bob $13 Carlos $3 Barb 12 Courtney 4 Bill 11 Chuck 5 Bart 10 Cindy 6 Brent 9 Craig 7 Betty 8 Chad 8 Instructions: Enter your answers as whole numbers. a. What is the total surplus if Bob buys a unit from Carlos? b. What is the total surplus if Barb buys a unit from Courtney?c. What is the total surplus if Bob buys a unit from Chad'iI Cl d. If you match up pairs of buyers and sellers so as to maximize the total surplus of all transactions, what is the largest total surplus that can be achieved? Cl