#$3$ An investor buys $$18$ thousand dollars of ABT stock at $$20$ per share, using $60\%$ initial margin. The broker charges $7\%$ APR compounded daily on the loan, and requires a $35\%$ maintenance margin. The stock pays $$0\mathrm{.}67$ per share dividend each year. If the stock is sold at the end of the year at $$21$ per share, what is the investor's rate of return?

Enter answer in percents, accurate to $2$ decimal places.