Traditional $401(k)$ versus Roth $401(k)$

Poornima has decided to contribute to a savings program. She can open a traditional $401(k)$ or a Roth $401(k)$ and has determined that she car a $$15,600$ contribution. Poornima's salary is $$130,500$ per year, and she is in the $32\%$ tax bracket.

If Poornima decides to go with a traditional $401(k),$ her contribution amount will be

And the amount offset via a reduced tax bill will be

If$,$ instead, Poornima decides to go with a Roth $401($k$),$ her contribution amount will be

And the amount offset via a reduced tax bill will be

Assuming all the same facts, suppose that Poornima decides to open both $401(k)$ plans, splitting what she can afford to contribute equally betwe both plans.

Under this scenario, Poornima's contribution amount will be

And the amount offset via a reduced tax bill will be

When Poornima retires, which plan's monies will she be able to exclude from taxable income?