Answer:
Annual yield in July 2011:
Quarterly dividend = $0.43 per share
Annual dividend = 4 * $0.43 = $1.72 per share
Stock price = $30 per share
Annual yield = ($1.72 / $30) * 100% = 5.73%
Current annual yield:
Quarterly dividend = $0.52 per share
Annual dividend = 4 * $0.52 = $2.08 per share
Stock price = $30 per share
Annual yield = ($2.08 / $30) * 100% = 6.93%
Yield to cost is the return on investment based on the original cost of the stock. Without information on when the stock was purchased, we cannot calculate yield to cost.
In order to calculate the dividend growth rate over the past 10 years, we would need data on the historical dividends paid by AT&T. Without this information, we cannot calculate the dividend growth rate.
Whether AT&T stock was a good investment over the last 10 years would depend on factors such as the stock's performance relative to the market and the investor's personal investment goals and risk tolerance. However, given the increase in annual yield from 5.73% in July 2011 to 6.93% currently, it appears that the stock has provided a consistent and growing dividend yield over time.
Other information that might be helpful in making a judgment concerning question #5 could include AT&T's earnings history, market trends and industry competition, the company's future growth prospects, and the overall economic climate.