Final answer:
Melissa can deduct $250 for the conference registration fee, $53.5 for mileage, and $90 for parking, totaling $393.50. However, since the options provided do not match this total, the closest correct answer is $390 (option 4), assuming a typo or error in the question or options.
Step-by-step explanation:
To calculate the total amount Melissa can deduct for the conference, we need to add the registration fee, mileage costs, and parking fees. Her registration fee is $250, and her mileage costs for driving 100 miles at 53.5 cents per mile is $53.50. Additionally, her parking fee is $90. The total deduction is the sum of these costs:
- Registration fee: $250
- Mileage costs: $53.50 (100 miles × $0.535/mile)
- Parking fee: $90
When we add these amounts together: $250 + $53.50 + $90 = $393.50, it appears there is a discrepancy in the options provided as none match the calculated amount. Based on the context, the closest correct answer, thereby assuming a possible typo in the question or the options, would be $390 (option 4).