this is a management science question, can you please explain your objective function, decision variables, and constraints clearly?

Q3. Kemal wants to make a multi-period investment with a budget of $300,000. There exist 3 different investment opportunities for 5 years period. All the money available at the beginning of each year must be fully invested. The money can be reinvested immediately for any of the investment opportunities whenever it is available. Additionally, Kemal wants that the amount invested in Y at the beginning of year i should be at least 20% of the amount invested in X at the beginning of year i for i=1,2,3. The required information regarding the investment alternatives is given in the table below: Formulate an LP model to maximize Kemal's total money at the beginning of year 6