In order to fund her retirement, mean requires a portfolio with an expected return of 12% per year over the next 30 years. She has decided to invest in shares 1,2 and 3 with 25% in share 1, 50% in share 2 and 25% in share 3. If shares 1 and 2 have expected returns of 9% and 10% per year, then what is the minimum expected annual return for share 3 that will enable megan to achieve her investment requirement?