The engineering team at Manuel\'s Manufacturing, Inc., is planning to purchase an enterprise resource planning (ERP) system. The software and installation from Vendor A costs $380,000 initially and is expected to increase revenue $125,000 per year every year. The software and installation from Vendor B costs $280,000 and is expected to increase revenue $95,000 per year. Manuel\'s uses a 4-year planning horizon and a 10% per year MARR.

a) What is the discounted payback period of each investment?

b) Which ERP system should Manuel purchase if his decision rule is to select the system with the shortest DPBP?