Answer
$2,476,000$.
Work Step by Step
Plugging in $x=32$: $D=3500-32^2=3500-1024=2476$
Thus the number of units sold is $2476\cdot1000=2,476,000$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.