An investor buys $100$ shared of stocks on margin price at a price of $$70$ per share. The initial margin requirement is $60\%$ and the lending rate is $3\%.$ The investor's broker charges a fixed commission of $$30$ per trade. The stock pays an annual dividend of $$2$ per share. One year later, the investor sells the $100$ shares at a price of $$60$ per share. What is the investor's rate of return? Following the question, what would be the investor's rate of return if he did not trade on margin?