Worldwide annual sales of smartphones in over a 5 year period were projected to be approximately  q = −10p + 4,540  million phones at a selling price of $p per phone. (a) Obtain a formula for the price elasticity of demand E. (b) In one particular year the actual selling price was $277 per phone. What was the corresponding price elasticity of demand? Interpret your answer. (c) Use formula for E to determine the selling price that would have resulted in the largest annual revenue. What, to the nearest $10 million, would have been the resulting annual revenue?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
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Chapter7: Exponents And Exponential Functions
Section7.8: Transforming Exponential Expressions
Problem 12PFA
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Worldwide annual sales of smartphones in over a 5 year period were projected to be approximately 

q = −10p + 4,540
 million phones at a selling price of $p per phone.
(a)
Obtain a formula for the price elasticity of demand E.
(b)
In one particular year the actual selling price was $277 per phone. What was the corresponding price elasticity of demand? Interpret your answer.
(c)
Use formula for E to determine the selling price that would have resulted in the largest annual revenue. What, to the nearest $10 million, would have been the resulting annual revenue?
 

(a)Obtain a formula for the price elasticity of demand E.

Recall that the price elasticity of demand E is the percentage rate of decrease of demand divided by the percentage increase of price, given by the formula.
E = − 
dq
dp
 · 
p
q
 

q = −10p + 4,540 for the demand of smartphones (in millions).
find the derivative
dq
dp
.
dq
dp
 = 
 
 
 
substitute the values for
dq
dp
 and q into the formula for the price elasticity demand.
E  =  − 
dq
dp
 · 
p
q
 
   =  − 
 
 
 
 
 
 
 
 · 
p
−10p + 4,540
 
   = 
 
 
 
 
 
 
 
p
−10p + 4,540
What is the price elasticity demand for smartphones
E = 
 
 
 
 .
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