Sids Skins makes a variety of covers for electronic organizers and portable music players. The companys designers have discovered a market for a new clear plastic covering with college logos for a popular music player. Market research indicates that a cover like this would sell well in the market priced at $21. Sids desires an operating profit of 20 percent of costs.

Required:

What is the highest acceptable manufacturing cost for which Sids would be willing to produce the cover? (Round your answer to 2 decimal places.)