Based on the following cash flows, determine the optimal time to abandon the project. Assume the cost of capital is 10%. O Year 1. Year 2. O Year 3. O Year 4. Year 0 1 2 3 4 Cash Flow -$1,000 $800 $650 $550 $500 Salvage value at the end of year d (Sd) 700 550 450 400