You made the following rates of return on your investments that you sold one year
later (listed in the table below):
Company Price Count Return
Robot International $38.25 4,000 10%
Blackbear Brewing $42.50 6,000 12%
Essex Oil $28.30 10,000 -4%
What is the average rate of return? Round your answer to 2 decimal places if needed.
Do not include any dollar signs or percentages in your answer.