Paul Is Employed as an Auditor by a CPA Firm

Essay

Paul is employed as an auditor by a CPA firm. On most days, he commutes by auto from his home to the office.
During one month, however, he has an extensive audit assignment closer to home. For this engagement, Paul drives directly from home to the client's premises and back. Mileage information is summarized below:
Home to office 12 miles Office to audit client 15 miles Audit client to home 10 miles
If Paul spends 20 days on the audit and provides an adequate accounting to his employer, what is his reimburseable mileage?