Staci works as an auditor for a large CPA firm. During the months of August and September of each year, she is assigned to the team auditing Orchid Corporation. As a result, every day she drives from her home to Orchid and returns home after work. Mileage is as follows:

Home to office 9 miles

Home to Orchid 15 miles

Office to Orchid 7 miles

For the period of August and September, Staci's deductible mileage for each workday is:

	a.	7.
	b.	30.
	c.	31.
	d.	None of the above.