7. A 2n annuity immediate has payments of 1 for the first n years and 5 for the second n years. If the annual effective interest rate is i, the present value for the annuity is 45.7753201471752 . Also if the annual effective interest rate is i, the proportion of the total present value accountable by the second n years is 0.769823555046403 . Find the annual effective interest rate required to force the proportion for the first n years to be equal to the proportion for the second n years