I'm stuck at last three question for my homework. Please help me

QUESTION 9 The two projects below are possible investments. You require a return of 129. Year Project Y Project Z 0 -$31,000 -$60,000 14,000 24,000 12,400 23,000 RUN- 14,800 22,000 10,400 21,000 The profitability index for Project Y is for Project Z is The NPV for Project Y is for Project Z is Based on the above calculations, Project should be accepted. QUESTION 10 An investment project provides cash inflows of $875 per year for eight years. The project payback period is years, if the initial cost is $3,200. The project payback period is years, if the initial cost is $4,600. The project payback period is years, if the initial cost is $7,900QUESTION 11 Two mutually exclusive projects have been identified as below: Year Cash Flow (A) Cash Flow (B) -$65,000 -$65,000 34,000 19,000 WNO 27,000 25,000 21,000 29,000 17,000 34,000 The IRR for project A is for project B is Based on IRR, Project should be accepted. If the required return is 11%, the NPV for project A is , and for project B is Based on NPV, Project should be accepted