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 $7,500 $ 8,250 $10,500 $12,000 $13,500 $10,750 $9,750 March 4.000 6,500 8,000 10,500 12,000 9,000 7,500 April May June July August September 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 is the estimated cost formula for custodial supplies expense? O Y $4,500+ $0.75 X $7,500 + $0.45 X Y $2,080 + $$0.80 X Y $6,120+ $0.50 X None of the abovc