High-Low Method; Predicting Cost The Lakeshore Hotel's guest-days of Occupancy and custodial supplies expense over the last seven months were. Month Guest day Occupancy Custodial Supplies Expense March . 4,000 7,500 April . 6,500 8,250 May . 8,000 10,500 June . 10,500 12,000 July . 12,000 13,500 August . 9,000 10,750 September . 7,500 9,750 Guest- day is measaured 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. Questions: I. Using the high-low method, estimate a cost formula for custodial supplies expense. 2. Using the cost formula you derived above, what amount of custodial supplies expenses would you expect to be incurred at an occupancy level of 11,000 guest days?