need to solve for 7,9,10,11

7. What is meant by the term internal rate of return? Explain the IRR decision rule? 8. For the purpose of calculating net present value and internal rate of return, do companies use the accrual basis of accounting? Explain. 9. Why might a firm choose to accept a long-term investment even if the net present value is below zero? 10. What might cause a manager to reject a long-term investment even though the net present value is positive? 11. Describe the two steps required to calculate net present value and internal rate of return when using Excel