Assignment problem using branch-and-bound. Kindly show answers along with some explanation. Thank you.

A factor),F has three workers, Anne, Bob, and Dave. It also has three tasks which must he carried out. Each worker can carryF out all the tasks but with varying efciency. The cost for each worker to carryr out each task is given in the following table: $5230 $4.ou The factor};' wants to assign these tasks to the three people in the most cost efficient way. Each task must he completed by a different worker. i.) Calculate a lower bound on the cost for completing the three tasks. Is this a feasible solution? ii.) Calculate an upper bound on the cost for completing the three tasks. Is this an optimal solution in general? {10 marks}