Melissa recently paid $675 for round-trip airfare to San Francisco to attend a business conference for three days. Melissa also paid the following expenses: $380 fee to register for the conference, $405 per night for three nights' lodging, $170 for meals and $370 for cab fare.

Note: Do not round intermediate calculations. Round your final answers to the nearest whole dollar amount. Leave no answers blank. Enter zero if applicable.

a. What amount of these costs can Melissa deduct as business expenses?

b. Suppose that while Melissa was on the coast, she also spent two days sightseeing the national parks in the area. To do the sightseeing, she paid $1,100 for transportation, $800 for lodging, and $355 for meals during this part of her trip, which she considers personal in nature. What amount of these costs can Melissa deduct as business expense?

c. Suppose that Melissa made the trip to San Francisco primarily to visit the national parks and only attended the business conference as an incidental benefit of being present on the coast at that time. What amount of the airfare can Melissa deduct as a business expense?

d. Suppose that San Francisco was Melissa's permanent residence and business location. She attended the conference in San Francisco and paid $380 for the registration fee. She drove 182 miles over the course of three days and paid $183 for parking at the conference hotel. In addition, she spent $430 for breakfast and dinner over the three days of the conference. She bought breakfast on the way to the conference hotel, and she bought dinner on her way home each night from the conference. What amount of these costs can Melissa deduct as business expenses?

Note: Use standard mileage rate.