Real Estate Principles 3rd Edition by David Ling,Wayne Archer

Exercise 14

Use the following information to answer questions 2 to 5. Rosie Malone sold her house to D.M. Band. The contract was signed June 1, 2004, and closing was set for June 25, 2004. Rosie had prepaid her three-year hazard insurance policy in the amount of $425.00 on April 1, 2003, and D.M. agreed to assume it at closing. Water and sewer are paid the first of each month for the previous month. They are estimated to total $100 for June. D.M. also agrees to assume Rosie's mortgage, which will have a balance of $85,385 on date of closing. Monthly payments are $817.83 payable on the first of the month for the previous month. The seller is responsible for the day of closing.
How would the water and sewer charges be prorated