Kendra's son needs math tutoring. She has found a tutor with lots of experience and great reviews. The tutor charges a retaining
fee of $5 per week, and an hourly fee after that. After the first week of tutoring, during which they met for 10 hours, the tutor gives Kendra a bill of $336. What hourly rate does the tutor charge? [Round your answer to the nearest cent.)
