Sandra, an orthodontist, is single and has net earnings of $90,000 from her practice. In addition, she collects antique books that she buys and sells at antique shows. She participates in six to eight weekend shows per year. Her income and expenses for the current year are as follows:

Revenue from sale of antique books

$22,000

Expenses

 

Cost of goods sold

12,000

Show registration costs

3,000

Advertising

1,000

Dealer’s license—annual fee

500

Insurance

900

Depreciation of display cases

1,200

Sandra has no other items that would affect her AGI. Itemized deductions consisting of taxes, interest, and charitable contributions are $19,000. Calculate Sandra’s taxable income if the antique book activity is classified as:

a. A hobby.

b. A business.