Rooter's Cleaning Services provided data concerning the costs incurred to clean hotel rooms for which hotel customers pay $150 per night. Data for the past 7 months are as follows: July 260 January February March April May June Number of rooms 250 160 200 150 270 1 70 cleaned Cleaning $6,450 $4,060 $5,100 $4,100 $6,880 $4,200 cost How much are estimated monthly variable costs using the high-low method? $6,530 Round to two decimal places. Your