9. Duane Hartley owns 2,000 shares of Heban Oil stock, which he purchased for $28.40 each. Recently he read that the average selling price of his stock was $37.90. The company paid annual dividends of $1.80 per share last year. (a) What is the annual yield on his stock? (b) For an investor who purchased the stock at $37.90 per share, what is the annual yield?