Question 15(6.76 points)

Sam refuses to retire until his retirement account has a balance of at least $ 320,795 . Sam refuses to make any more deposits in the account. The account currently has a balance of $ 103,665 and earns 6% per year, compounded semi-annually. How long does Sam have before he will retire?(You are computing number of years. Round your answer to one decimal place. For example, record 14.294 years as 14.3).