# Geometric Sequence

• Apr 8th 2010, 06:02 PM
sahip
Geometric Sequence
Luke purchased an automobile for \$5000 and the value of the automobile decreases by 20% each year. How many years from the date of purchase will the value of the automobile be \$3200 ?

Thank you.
• Apr 8th 2010, 06:28 PM
skeeter
Quote:

Originally Posted by sahip
Luke purchased an automobile for \$5000 and the value of the automobile decreases by 20% each year. How many years from the date of purchase will the value of the automobile be \$3200 ?

Thank you.

$3200 = 5000(0.8)^t$

solve for t in years