Answer:
$450
Step-by-step explanation:
For a ROTH 401 (k) qualified distribution to be non-taxable, either of the following conditions should be met:
1. Individual should be more 59 and a half years old or more.
2. Has held the account for 5 years or more.
In this case, Heidi invested at the age of 57 and received distribution of $4,500 after 8 years. So she meets both criteria but the type of distribution she received is a non-qualified one. So, $4,500 is subject to tax as per ordinary income at 10% that is $450 (0.1*4,500).
Heidi is not subject to any amount if early distribution penalty as she meets both criteria.