Partially automated scanner that reads the piece-goods vouchers costs about 1308900 to make it operational. Operating costs are projected to be around 655,500 per year. The scanner is expected to last for five years. The scanners net salvage value is 130,000, according to estimates. The new automated system is estimated to save birr 1,700,500 in labour cost per year calculate - net cash flow over the life of the scanner - what is the time frame for recouping your investment - if the interest rate is 15% after taxes, what would be the discount pay back period?