You invest 7500 into a mutual fund that is expected to earn 7% per year, how long will it take the fun to be worth 15000?

Roger bought 800 shares of a company stock for 15.34/share. He pays the broker commission of 20 dollars to buy or sell stock after one year Roger sold all his shares when they were worth 18.77/share.

A.) how much it cost to buy the stock?

B.) what is the net gain or loss?

C.) what was the rate of return?