(Solving for n with non-annual periods) Approximately how many years would it take for an investment to grow sixfold if it were invested at 18 percent compounded weeldy? Assume that you invest $1 today If you invest 51 at 18 percent compounded weekly, about how many years would it take for your investment to grow sixfold to 567 (Hint Remember to convert your calculator solution to years.) years (Round to one decimal place.)