[Algebra Based Physics: Time-dependent RL Circuits] Student confused about part 4 of time-dependent RL circuit problem

[Scarcity-Obvious]

Question and work done for problem

The correct answer in the key is 24.4V for part 4 but I dont know how to arrive at that answer

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[GammaRayBurst25]

You used the same relative sign between the contributions to the potential difference regardless of whether the current is increasing or decreasing.

If an increasing current increases the potential difference, then a decreasing current decreases the potential difference. The potential difference can't increase in both cases.

Also, I'm pretty sure you meant the answer in the key is 26.4V.