A travel agency will plan a group tour for groups of size 20 or larger. If the group contains exactly 20 people, the cost is $240per person. If each person's cost is reduced by $10 for each additional person above the 20, then the revenue is given by the equation shown below, where x is the number of additional people above 20. R(x) = (20 + x)(240 − 10x) Find the marginal revenue if the group contains 25 people. $

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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A travel agency will plan a group tour for groups of size 20 or larger. If the group contains exactly 20 people, the cost is $240per person. If each person's cost is reduced by $10 for each additional person above the 20, then the revenue is given by the equation shown below, where x is the number of additional people above 20.

R(x) = (20 + x)(240 − 10x)

Find the marginal revenue if the group contains 25 people.
$

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