In 2021, Lucy acquires a car for $14,000. She uses the car in her advertising business and for personal purposes. Her records indicate the car is used 70% for business and that the total operating expenses, including depreciation, are $3,800.

a. How should Lucy treat the operating costs of the car for tax purposes?

b. In 2024, Lucy sells the car for $6,500. Her business use for 2022 through 2024 remains at 70%, and she properly deducted $5,880 in depreciation. What is her taxable gain or loss from the sale of the car?