PLEASE SHOW ALL YOUR CALCULATIONS AND GIVE AN EXPLANATION!!

1. A new inventory management system for ABC company could be developed at a cost of $280,000. The estimated net operating costs and estimated new benefits over six years of operation would be: Estimated Net Operating costs Estimated New Benefits ($280,000) ($6,000) $40,000 ($9,800) $80,000 ($11,000) $82,000 ($14,000) $115,000 ($15,000) $120,000 $140,000 ($25,000) a. What would be the payback period for this investment? b. Assuming a 12% discount rate, what is this investment's NPV