North Dakota Electric Company estimates its demand trend line (in millions of kilowatt hours) to be: D = 80.0 + 0.45Q,

where Q refers to the sequential quarter number and Q = 1 for winter of Year 1. In addition, the multiplicative seasonal factors are as follows:

Quarter Factor (Index)

Winter 0.72

Spring 1.25

Summer 1.40

Fall 0.63

In year 26 (quarters 101-104), the energy use for each of the quarters beginning with winter is (round your response to one decimal place):

90.3 ; 157.4 ; 176.9 ; 79.9

Explanation:

Given that:

Estimated demand trend line (in millions of kilowatt hour) for North Dakota Electricity company is :

D = 80.0 + 0.45Q,

Q = quarter number

Quarter Factor (Index)

Winter 0.72

Spring 1.25

Summer 1.40

Fall 0.63

In year 26 (quarters 101-104):

Energy use (E) for each quarter = (Demand * quarter factor)

Winter ; Q = 101

E = [80.0 + 0.45(101)] * 0.72 = 90.3

E = [80.0 + 0.45(102)] * 1.25 = 157.4

E = [80.0 + 0.45(103)] * 1.40 = 176.9

E = [80.0 + 0.45(104)] * 0.63 = 79.9

first one

explanation: