II made a hypothetical retirement portfolio with assets of gold and real estate equities. A larger amount of funds go to gold the rest to real estate equities. I need to build an integer linear programming problem that includes a k out of n alternatives constraint. Clearly outline this constraint and explain its meaning. I didn't assign any values pertaining to the $\%$ allocation for each asset, but lets say it is a $60\%$ to gold and $40\%$ to real estate equities. I hope this is what you need because I don't know how to answer my question to you