Answer:
$30,000
Explanation:
Based on the information given we were told that he has always lived in Arizona in which he earned the amount of $30,000 from a separate job that he did in California which means that the amount of $30,000 that was earned in California will be subject to tax or taxable reason been that every income that is been earned in California will be subject to tax in California.
Therefore the amount of his income that is taxable in California will be $30,000