Answer
$\$0.15/application$
Work Step by Step
We know that 40 applications cost $\$6$ dollars. We figure out the cost per application with division:
$\displaystyle \frac{\$6}{40~applications}=\$0.15/application$
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.