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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 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?