Answer
year $ 2020$
Work Step by Step
Step 1. Based on the given conditions, we can set up a linear equation to model the price as
$P=2.69+0.17x$
where $x$ is the number of years after 1980.
Step 2. To get a price of $9.49$ dollars, let $P=9.49$. We have
$9.49=2.69+0.17x$
which gives
$x=\frac{9.49-2.69}{0.17}=40\ yrs$
That is, in the year $1980+40=2020$.
