The answer is below.
Work Step by Step
You want them to determine it based on the cost. After all, the selling price is higher than the cost, so you want them to consider the profit based on the lower value, the cost.
You can help us out by revising, improving and updating this answer.Update this answer
After 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.