Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 12 - Sequences; Induction; the Binomial Theorem - Chapter Review - Chapter Test - Page 840: 15



Work Step by Step

We know that $a_n=a_1r^{n-1}.$ where $r$=common ration (we can get this by dividing any two consecutive terms) and $a_1$= the first term Here $a_1=\$31000$ and $r=0.85$ (because of the $15$ percent price decrease), hence $a_{10}=a_1(r^{10-1})=\$31000(0.85^9)=\$6103.11$
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