Show me the steps to solve Many companies and organizations offer $401$K plans that allow for individual allocation choice within a set of assets. One example is

the American Dental Association; this information is from the information they provided to their members in July $2022.$

Suppose you are helping someone make their investment decisions between these funds and the following information. To ensure diversification, the minimum investment of each fund should be $2\mathrm{.}5\%,$ but no more than $70\%$ can be invested in any given fund. Assume, initially, that any risk level $($beta$)$ is acceptable. What investment strategy yields the optimal return? The optimal annual return is $15\mathrm{.}18.$