Computing the Tax. Donna files as a head of household in $2023$ and has taxable income

of $$110,000,$ including the sale of a stock held as an investment for two years at a gain of

$$20,000.$ Only one asset was sold during the year and Donna does not have any capital loss

carryovers.

a$.$ What is the amount of Donna$$s tax liability?

b$.$ What is the amount of Donna$$s tax liability if the stock is held for $11$ months?