PLEASE EXPLAIN I know the answer I need to know how to get that.

1. A five-star hotel buys bouquets of flowers to decorate its common areas and guest rooms. Its flexible budget for flowers is $325 per day of operations plus $7.20 per room-day. (A room day is a room rented for one day; a room is decorated with flowers only if it is occupied.) If this month the hotel operated for 30 days and it had 7,680 room-days, what would be the flexible budget amount for flowers for the month?

1. $55,296

2. $65,046

3. $9,750

4. $332.20