A question on Financial Math.

Please help. Thank you so much.

The following table shows the market information of three bonds: Market price Macaulay duration Modified convexity 96.3701 3.8250 17.4158 100 6.2421 44.3612 109.3851 9.4408 103.867 (*Note: The duration and convexity in the above table are calculated based on the annual effective yield rates of the bonds) The term structure of interest rate is assumed to be flat and the annual effective interest rate is currently in = 4%. Suppose that the investor wishes to invest his wealth into these 3 bonds for 7 years and construct a portfolio such that the IRR of the investment is at least in = 4% (regardless of the level of future interest rate), determine the best portfolio for the investor. Provide full iustification to your