What is the regular payback period for each of the projects?

Chapter 10/Challenge Problem 5-21 (page 446)
Your division is considering two investment projects, each of which requires an up-front expenditure of $25 million. You estimate that the cost of capital is 10% and that the investments will produce the following after-tax cash flows (in millions of dollars):
Year Project A Project B
1 5 20
2 10 10
3 15 8
4 20 6
a. What is the regular payback period for each of the projects?
b. What is the discounted payback period for each of the projects?
c. If the two projects are independent and the cost of capital is 10%, which project or projects should the firm undertake?
d. If the two projects are mutually exclusive and the cost of capital is 5%, which project should the firm undertake?
e. If the two projects are mutually exclusive and the cost of capital is 15%, which project should the firm undertake?
f. What is the crossover rate?
g. If the cost of capital is 10%, what is the modified IRR (MIRR) of each project?
Requirements of the assignment:
Paper. Write a Paper to answer the Questions and explain your calcualtions results in the paper (not the actual calcuations), attaching the Excel workbook as an Appendix with the detailed calcualtions, referrinfg to the calculation details in your paper by referencing the Appendix page in the Excel Workbook.
APA. All papers must follow all APA requirements. (10% deduction if not). See APA 7th edition for using Appendices for your Excel workbook.
Length. The paper is to be 2-page minimum/3-page maximum (not including title and references page).
Title page and reference page are required. However, they do not count towards any page count.
Analysis. Writing should reflect an understanding of the chapter’s basic concepts, thorough research, and logic and critical thinking skills.
References/Citations. You must include scholalry sources as references and citations. At a minimum you must include the textbook as a reference. And any refernce listed must be used and cited in your paper. You need to provide citations for all instances where you use information/thoughts from outside knowledge, even if not quoted. Citations are required and need to be included and tied to all references. Not providing references and citations can be an issue of academic integrity if attribution not provided for insights gained from outside sources. This also significantly impacts the grade on content, since authority of analysis is limited. See APA 7th edition for more details. In addition to the citatiosn, remember that quoted material must always have a citation with page #.
Introduction. The introduction is attention getting with sufficient background information to establish the topic and a clear thesis statement. The introduction presents the background to your study, introduces your topic and aims, and gives an overview of the paper.
Conclusion. The conclusion summarizes the main points and leaves the reader with a strong comprehension of the paper’s significance and the author’s understanding. The conclusion is intended to help the reader understand why your research should matter to them after they have finished reading the paper; a synthesis of key points and finding you want the reader to take way from your analysis.
Writing mechanics. Grammatically correct – No spelling, grammar, or mechanics errors.
Excel. An Excel template is attached. The Excel workbook can either be copy/pasted into your paper AFTER the references page as an Appendix or submitted as a separate document along with your paper Word document when submitting the assignment.