Tucker, a single taxpayer, actively participates in a rental real estate activity. During the year, his total rental real estate income was $25,000. His only other income for the year was $185,000 in wages. He does not have any adjustments to income, nor does he have any expenses allocable to investment income. How much of Tucker's income is subject to the net investment income tax? $0 $10,000 $25,000 $210,000