The Lakeshore Hotel's guest-days of occupancy and custodial supplies expense over the last seven months were Guest-days of Custodial Supplies Occupancy Expense Month March April May June July August September 4.000 6,500 8,000 10,500 12,000 9,000 7,500 $7,500 $ 8,250 $10,500 $12,000 $13,500 $10,750 $ 9,750 Guest-days is a measure of the overall activity at the hotel. For example, a guest who stays at the hotel for three days is counted as three guest- days. Using the high-low method. what amount of custodial supplies expense would you expect to be incurred at an occupancy level of 11,000 guest- days? $8,600 $5,245 $15,040 $9.250 $12.750