Question 1A-F please show work

What is the payback period on each of the following projects? Given that you wish to use the payback rule with a cutoff period of two years, which projects would you accept? If you use a cutoff period of three years, which projects would you accept? If the opportunity cost of capital is 10%, which projects have positive NPVs? "If a firm uses a single cutoff period for all projects, it is likely to accept too many short-lived projects." True or false? If the firm uses the discounted-payback rule, will it accept any negative-NPV projects? Will it turn down positive-NPV projects? Explain