Sterling Glass Company uses the high-low method to analyze mixed costs. The following information relates to the production data for the first six months of the year Month January February March April May June Cost $4,515 $4,82 $5,540 $4,485 $5,685 $5,230 Hours 300 400 550 200 800 500 What is the estimated total cost at an operating level of 900 hours? $5,275 O $5,745 O $515 O$5.885