You didn't state what the problem is you're trying to solve, so I'm guessing you're trying to figure out what your out-of-pocket expenses were for the trip.
Gas Costs = (1780 miles/15 mpg)*(2)*($4.35 per gallon)
Hotel Costs = ($95 per night)*(2 nights)*(1.12) [1.12 is cost plus tax]
Meal Costs = ($35 per day)*(2 days)*(1.20) [1.20 is cost + tip]
Personal Costs = ($589.95 + $265.95)*(1.0925) [1.0925 is cost plus tax]
Your Total Expenses = Gas Costs + Hotel Costs + Meal Costs + Personal Costs
Your company reimburses 75% of your travel expenses and 50% of hotel and meals:
Reimbursements = (0.75)*(Gas Costs) + (0.50)*(Hotel Costs + Meal Costs)
Out-of-Pocket Costs = (Your Total Expenses) - (Reimbursements)