Gator Beach Marts, a chain of convenience grocery stores in the Fort Lauderdale area, has store hours that fluctuate from month to month as the tourist trade in community varies. The utility costs for one of the company's stores are listed below for the past six months.

Month Total Hours Operation Total Utility Costs

January 550 3,24

Feb 600 3,400

March 700 3,800

April 500 3,200

May 450 2,700

June 400 2,600

Use the high-low method to estimate the cost behavior for the store's utility costs. Express te cost behavior in formula form (Y=a+bX). What is the variable utility cost per hour of operation?