Return to sales  The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows. where S1 and S2 are the sales revenue in millions of dollars and x1 and x2 are millions of dollars of expenditures for television advertising. (a) What advertising expenditures would maximize sales revenue in each district? (b) How much money will be needed to maximize sales revenue in both districts?

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
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Return to sales  The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows.

where S1 and S2 are the sales revenue in millions of dollars and x1 and x2 are millions of dollars of expenditures for television advertising.

(a) What advertising expenditures would maximize sales revenue in each district?

(b) How much money will be needed to maximize sales revenue in both districts?

 

Expert Solution
Given,

S1=30+20x1-0.4x12S2=20+36x2-1.3x22

Differentiating S1=30+20x1-0.4x12 with respect to x1, we get

S1'=0+201-0.42x1=20-0.8x1

Differentiating S2=20+36x2-1.3x22 with respect to x2, we get

S2'=0+361-1.32x2=36-2.6x2

Step 2

a).

The maximum value of sales revenue occurs at which first derivative is zero. That is,

S1'=020-0.8x1=00.8x1=20x1=25

&

S2'=036-2.6x2=02.6x2=36x2=13.8461

Hence,

Advertising expenditures of 25 million dollars would maximize sales revenue in region 1.

Advertising expenditures of 13.8461 million dollars would maximize sales revenue in region 2.

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