11. A company's stock price rose 2.9% in 2011 and increased 79.8% in 2012. Compute the geometric mean rate of return for the two year period. If someone purchased $1000 worth of stock at the start of 2011, what is its value at the end of 2012? Over the same period, another company had a geometric mean rate of return of 9.1% . If you had purchased $1000 of that stock, what would it be worth at the end of the two year period? a. b. c