The engineering manager of company A proposes to install an automated bar- code scanner costing. $4000.he estimates that he can save about 100 hours of labor time per month ,as products can now be scanned much faster. He reasons that at the wage rate of $ 15 per hour, the benefit for using the automated bar-code scanner is $ 1500 per month, and the scanner can be paid back in 2.67 months.