Answer
$6.25\%$.
Work Step by Step
First, we find the difference
$$6800-6375=425$$
Now, since $$\frac{425}{6800}=0.0625$$
then the percent markdown is $6.25\%$.
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.