The President's Inn Guest Database provides a list of customers, rooms they

occupied, arrival and departure dates, number of occupants, and daily rate for a

small bed-and-breakfast inn during one month. 4 Room rates are the same for one

or two guests; however, additional guests must pay an additional $20 per person

per day for meals. Guests staying for seven days or more receive a 10% discount.

Modify the spreadsheet to calculate the number of days that each party stayed at

the inn and the total revenue for the length of stay. Calculate the total sum of

revenue from the bookings in the database.