Morrisons Company heats iron jewels to high temperature by placing them in large ovens. The heated

jewels are then run through a machine that forms them into shapes. Due to the length of time it takes

for the oven to heat up, it is never turned off. When the jewels 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 Jewels is ready to be heated. The following information shows the jewels processed

and the electricity cost over the past 11 months.

Month Jewels Electricity Cost

January 80 $5,500

February 100 $6,800

March 120 $7,600

April 70 $5,000

May 110 $7,000

June 150 $8,000

July 70 $4,700

August 90 $6,200

September 50 $3,900

October 40 $3,050

November 60 $4,200

1. Using the high-low method, estimate a cost formula for power costs. Express the formula in the

from of Y = a + bX.

2. Predict total electricity cost in a month when 180 jewels are processed.