College Board BB Math Error? Is the answer wrong?

Test Preparation
1

<p>I got a question wrong in the College Board BB 2nd edition, and I'm not sure if I'm wrong or if the answer key is incorrect. There was (for sure) a printing error in another one of the practice tests in this book, so the answer being wrong could be a possibility...
Practice test 8, section 7 (math), number 17:</p>

<p>Luke purchased an automobile for $5,000, and the value of the automobile decreases by 20 percent each year. The value, in dollars, of the automobile n years from the date of purchase is given by the function V, where V(n) = 5000(4/5)^n. How many years from the date of purchase will the value of the automobile be $3,200?</p>

<p>(A) One
(B) Two
(C) Three
(D) Four
(E) Five</p>

<p>I got (B) Two, but it says that the correct answer is (C) Three. At first, I thought I forgot to add one to the n number of years or something silly like that, but it clearly states in the problem "n years from the date of purchase," then "How many years from the date of purchase," meaning that the answer is whatever n is. And n is definitely 2, no matter what way you solve it.</p>

<p>So am I correct? Or am I wrong? If I am wrong, can you please explain how you'd get 3? Thanks!!!!</p>

2

<p>It’s definitely n = 2 years…</p>

3

<p>Yes, the answer is B, which is listed as correct in my book. What edition do you have? Someone probably reported it in an earlier edition, so they got it changed.</p>

4

<p>I have the 2nd edition, and I know there’s a 3rd, so you’re right, it’s probably just outdated. Sweet, +30 points for me!</p>

5

<p>@sdnni09</p>

<p>Yes, that was indeed an error in the earlier edition of the Official SAT guide. Here is a link to the errata(includes updated conversion charts) in case you encounter other mistakes: [ERRATA</a> The Official SAT Study Guide: Second Edition](<a href=“http://us.macmillan.com/splash/bookseller/documents/2009/09b_640_SAT_SG_Errata_WEB_090728.pdf"]ERRATA”>http://us.macmillan.com/splash/bookseller/documents/2009/09b_640_SAT_SG_Errata_WEB_090728.pdf)</p>

6

<p>Thanks so much, there are a few more mistakes haha</p>