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 $330,000 initially and is expected to increase revenue $135,000 per year every year. the software and installation from vendor b costs $280,000 and is expected to increase revenue $100,000 per year. manuel’s uses a 4-year planning horizon and a 13.0 % per year marr. part a what is the present worth of each investment?