Rita is a self-employed taxpayer who turns 39 years old at the end of the year (2018). In 2018, her net Schedule C income was $268,000. This was her only source of income. This year, Rita is considering setting up a retirement plan. What is the maximum amount Rita may contribute to the self-employed plan in each of the following situations?

a. She sets up a SEP IRA.

b.. She sets up an individual 401(k).