An investor has $100,000 to invest right now (the beginning of year 1). The cash flows associated with five available investments are listed in the file P04_61.xlsx. For example, every dollar invested in A in year 1 yields $1.40 in year 4. In addition to these investments, the investor can invest as much money each year as he wants in CDs, which pay 3% interest. The investor wants to maximize his available cash in year 4. Assuming that he can put no more than $50,000 in any investment, develop an LP model to help the investor achieve his goal.