Melissa recently paid $400 for round-trip airfare to San Francisco to attend a business conference for three days. Melissa also paid the following expenses: $250 fee to register for the conference,
$300 per night for three nights' lodging,
$200 for meals in restaurants, and $150 for cab fare.

Required:
a. What amount of the travel 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 $1,000 for transportation, $800 for lodging, and $450 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?