Angela is planning a trip to Las Vegas. She can either fly into Las Vegas or drive a rental car. The air ticket costs $500. She can rent a car for $200 per week (cheaper than renting the car on a daily basis. So she plans to rent for a week even though she does not need the car after 6 days) and the trip takes exactly six days if she drives. She usually stays in Hilton whenever she travels and the expected cost is $100 per night (tax included). She would spend 4 nights in Las Vegas and two more nights on the way if she drives. Her food expenses would be $125 if she flies and $200 if she drives. The expected gas cost, if she drives, is $150. The opportunity cost of flying and driving options are:

	Flying option	Driving option
A	($1,150)	$1,150
B	(1,025)	$1,025
C	($1,150)	($1,025)
D	$1,025	$1,150
E	$1,150	$1,025

pls explain how to solve because the negative and positive confuses. when to use negative or positive?