Starbucks is evaluating a $900,000 investment in new coffee machines. The details are:

1. Initial Investment: $900,000
2. Depreciation @ 12%: $108,000/year
3. Book Values at Year-End: $792,000, $684,000, $576,000, $468,000, $360,000, $252,000, $144,000, $36,000, $0
4. Cash Flows: $180,000, $200,000, $160,000, $140,000, $120,000, $100,000, $80,000, $60,000, $40,000
5. Profits: $72,000, $92,000, $52,000, $32,000, $12,000, $-8,000, $-28,000, $-48,000
6. ARR: 8%, 9.5%, 5.78%, 3.56%, 1.22%, -0.89%, -3.89%, -6.67%
7. Average Profits: $21,000
8. Average Investment: $450,000
9. Average ARR: 4.67%
10. Payback: 5.5 years
11. NPV @ 10%: $50,000

Requirements:

1. Compute ARR, payback period, and NPV.
2. Assess the investment's viability.
3. Provide a final recommendation.