Jason Janitorial 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:
January February March April May June July
- Number of rooms cleaned 250 160 200 150 270 170 260
- Cleaning cost $6,450 $4,060 $5,100 $4,100 $6,530 $4,200 $6,640
How much are estimated monthly variable costs using the high-low method?