A drug store is looking into possibility of installing a 24/7- automated prescription refill system to increase its projected revenues by $20,000 per year over the next five years. annual expenses to maintain the system are expected to be $5000. The system will cost $50,000 and will have no market value at the end of five year study period. The store's MARR is 20% per year. Use the AW method to evaluate this investment.