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. 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