Valle Crucis Cabins has 7 units for rent. In July, all units were rented for all 31 days of the month. The July utility bill was 5 2310. In February 5 cabins were rented for 10 days each. The February utility bill was $ 640, in April, 6 cabins were rented for 14 days each and the monthly utility bill was $ 1000. Use the high-low method to determine the estimated feed cost component of the company's utility bill O 50 O $ 128 $ 140 $ 640