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 Cost Hours January $4,515 300 February $4,825 400 March $5,540 550 April $4,485 200 May $5,685 800 June $5,230 500 W

hat is the estimated total cost at an operating level of 900 hours?

a. $5,885.

b. $5,275.

c.$5,115.

d.$5,745.