please solve both questions in 50 minutes please... I'll give you up thumb definitely

3. You spent $1,000 to upgrade your facility. Because of this upgrade you experience the following cash flows: Year 1: \$200, Year 2: \$400, Year 3: \$700, Year 4: \$400 Year 5: \$400 What is the payback period? (express in years and days) 4. Why is the payback analysis a good one to use? Why is it a poor one to use