Shauna Coleman is single. She is employed as an architectural designer for Streamline Design (SD). Shauna wanted to determine her taxable income for this year. She correctly calculated her AGI. However, she wasn't sure how to compute the rest of her taxable income. She provided the following information with hopes that you could use it to determine her taxable income for 2023. Shauna paid $4,724 for medical expenses for care from a broken ankle in October. Also, Shauna's boyfriend, Blake, drove Shauna (in her car) a total of 115 miles to the doctor's office so she could receive care for her broken ankle. Shauna paid a total of $3,510 in health insurance premiums during the year (not through an exchange). SD did not reimburse any of this expense. Besides the health insurance premiums and the medical expenses for her broken ankle, Shauna had Lasik eye surgery last year and paid $3,110 for the surgery (she received no insurance reimbursement). She also incurred $494 of other medical expenses for the year. SD withheld $1,910 of state income tax, $7,605 of Social Security tax, and $14,940 of federal income tax from Shauna's paychecks throughout the year. In 2023, Shauna was due a refund of $294 for overpaying her 2022 state taxes. On her 2022 state tax return that she filed in April 2023, she applied the overpayment toward her 2023 state tax liability. She estimated that her state tax liability for 2023 will be $2,410. Shauna paid $3,310 of property taxes on her personal residence. She also paid $544 to the developer of her subdivision because he had to replace the sidewalk in certain areas of the subdivision. Shauna paid a $244 property tax based on the state's estimate of the value of her car. Shauna has a home mortgage loan in the amount of $242,000 that she secured when she purchased her home. The home is worth about $422,000. Shauna paid interest of $12,740 on the loan this year. Shauna made several charitable contributions throughout the year. She contributed stock in ZYX Corporation to the Red Cross. On the date of the contribution, the fair market value of the donated shares was $1,440 and her basis in the shares was $576. Shauna originally bought the ZYX Corporation stock in 2009. Shauna also contributed $344 cash to State University and religious artifacts she has held for several years to her church. The artifacts were valued at $544 and Shauna's basis in the items was $344. Shauna had every reason to believe the church would keep them on display indefinitely. Shauna also drove 200 miles doing church-related errands for her minister. Finally, Shauna contributed $1,310 of services to her church last year. Shauna paid $294 in investment advisory fees and another $194 to have her tax return prepared (that is, she paid $194 in 2023 to have her 2022 tax return prepared). Shauna is involved in horse racing as a hobby. During the year, she won $2,610 in prize money and incurred $14,400 in expenses. She has never had a profitable year with her horse-racing activities, so she acknowledges that this is a hobby for federal income tax purposes. Shauna sustained $2,110 in gambling losses over the year (mostly horse-racing bets) and had only $244 in winnings.

a) Assume Shauna's AGI is $129,000. Determine Shauna's taxable income.

b) Assume Shauna's AGI is $229,000. Determine Shauna's taxable income.