Hi , I sent this question before but I'm still confused about those two parts.So please I need a clear answer.

Melissa recently paid $660 for round-trip airfare to San Francisco to attend a business conference for three days. Melissa also paid the following expenses: $650 fee to register for the conference, $370 per night for three nights lodging, $360 for meals, and $305 for cab fare.

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 $1,700 for transportation, $1,055 for lodging, and $275 for meals during this part of her trip, which she considers personal in nature. What amount of the travel costs can Melissa deduct as business expenses?

d.

Suppose that Melissas permanent residence and business was located in San Francisco. She attended the conference in San Francisco and paid $650 for the registration fee. She drove 129 miles over the course of three days and paid $149 for parking at the conference hotel. In addition, she spent $230 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 the travel costs can Melissa deduct as business expenses?