Davis Stores sells clothing in 15 stores located around the southwestern United States. The managers at Davis are considering expanding by opening new stores and are interested in estimating costs in potential new locations. They believe that costs are driven in large part by store volume measured by revenue. The following data were collected from last year's operations (revenues and costs in thousands of dollars). Revenues Costs Store 101 $4,100 $4,214 102 2,227 2,894 103 5,738 5,181 104 3,982 3,998 105 2,914 3,676 106 4,023 3,319 107 6,894 5,029 108 1,779 2,374 109 5,416 4,688 110 3,228 2,959 111 3,886 4,179 112 4,690 3,200 113 3,552 2,556 114 4,817 4,655 115 2,124 2,986 Required: a. Use the high-low method to estimate the fixed and variable portions of store costs based on revenues. b. Managers estimate that one of the proposed stores will have revenues of $2.5 million. What are the estimated monthly overhead costs, assuming no inflation? c. Managers are also considering a "mega-store" with revenues of $10 million. What are the estimated monthly overhead costs, assuming no inflation