In 2000, Ms. Ennis, a head of household, contributed $46,000 in exchange for 460 shares of Seta stock. Seta is a qualified small business. This year, Ms. Ennis sold all 460 shares for $90,000. Her only other investment income was an $7,900 long-term capital gain from the sale of land. Her taxable income before consideration of her two capital transactions is $557,000. Assume the taxable year is 2018. Use Individual tax rate schedules and Tax rates for capital gains and qualified dividends.

Compute Ms. Ennis's income tax, Medicare contribution tax, and total tax for the year.

How would the computation change if Ms. Ennis acquired the Seta stock in 2011 instead of 2000?

How would the computation change if Ms. Ennis acquired the Seta stock in 2015 instead of 2000?