Blue Book Math Question - typo?

Test Preparation SAT Preparation
1

<p>Test 5, Section 2, #13: </p>

<p>The total daily cost c, in dollars, of producing x units of a certain product is given by the function </p>

<p>c(x) = [(600x-200)/x] + k</p>

<p>where k is a constant and x<= 100. If 20 units were produced yesterday for a total cost of $640, what is the value of k?</p>

<p>a) 40
b) 50
c) 60
d) 590
e) 600</p>

<p>The BB lists (e) as correct choice. Am I missing something? The answer seems like it is 50 -- i.e., plug in x=20 and you have k=50. Is this a typo in the BB?</p>

2

<p>never mind. There is a typo! (<a href=“http://talk.collegeconfidential.com/sat-preparation/753323-typo-new-blue-book.html[/url]”>http://talk.collegeconfidential.com/sat-preparation/753323-typo-new-blue-book.html&lt;/a&gt;)</p>

3

<p>Go, check the yellow paper at the end of the blue book…It mentions ALL the errors in the book with their corrections.</p>

4

<p>hmm… don’t see that. If it was a loose sheet of errata, my kid probably lost it… Thanks.</p>

5

<p>^Go to the nearest store, check the last page of any of the College Board’s Blue Books there and ask the librarian to print it for you or copy it down yourself.</p>

6

<p>thanks …</p>

7

<p>Actually you don’t even need to go get that sheet. The Blue Book Owner’s Area on the Collegeboard website has all the corrections. </p>

<p>[Welcome</a> to the Official SAT Study Guide Book Owner’s Area](<a href=“College Board - SAT, AP, College Search and Admission Tools”>SAT Study Guide – SAT Suite | College Board)</p>