(4 points) Perkins, a single female resident of California, initially calculated that she had no capital transactions during the year and that her Taxable income for 2020 was $30,000. However, upon reading her stock brokerage statement, she now has discovered that she also earned a long-term capital gain of $20,000. Perkins had no other capital transactions. By what amount, if any, does this capital gain increase her federal tax liability