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Travis Metals heats copper ingots to a high temperature by placing them in a large oven. The heated ingots are then run through a shaping machine that forms them into wire. Due to the length of time it takes the oven to heat up, it is never turned off. When the ingots are placed in the oven the temperature is raised to a higher level. Once they are done being heated the oven temperature is turned back down until a new batch of ingots is ready to be heated. The following information shows the ingots processed and the power costs over the past 10 months.

Month	Ingots	Power Cost
January		132		$	6,380
February		112		$	5,380
March		102		$	5,280
April		122		$	5,880
May		152		$	6,880
June		142		$	6,480
July		92		$	4,880
August		82		$	4,080
September		72		$	4,280
October		62		$	3,280

Required:

2. Using the highlow method, estimate a cost formula for power costs. Express the formula in the formY=a+bX.

3. Predict total power costs in a month when 162 ingots are processed.