A subcontracting excavation firm has signed a contract to excavate and dispose of 48,000 m3 of soil. The job is to be completed within 30 working days. The firm has to pay a liquidated damage of L. E. 10,000 for each delayed day. The contractor will not award the firm any contracts in the future if their delay exceeded 7 working daysAvailable Human Resources (your staff) Job Number Capacity m3/day /crew Rate L. E. / Day A Supervision Crew 3 3,000 One supervision-crew can manage up to 3,000 m3/ day. Available Equipment Resources (to be rented) Item Number Capacity m3/day Cost L. E /day Power Shovel [A] 5 800 1,600 Power Shovel [B] 5 600 1,080 Truck [A] 15 120 Truck [B] 15 100 A site can accommodate up to 6 power shovels.If we used more than 4 power shovels productivity of all power shovels will decrease by 5% for each extra power shovel used. REQUIRED A] Determine the optimum possible completion duration of the excavation task and calculate its minimum possible corresponding costs. B] Determine the minimum possible completion duration of the excavation task and calculate its minimum possible corresponding costs.