A lady sold her business for $500,000 and   wants to invest in condominiums units (which she intends to rent) and land   (which she will lease to a farmer). She estimates that she will receive an annual return of $8,000 for   each condominium and $6,000 for each acre of land. A condominium unit costs ,000 $30,000   per acre. A condominium will cost her   $1,000 per unit, an acre of land will cost $2,000 for maintenance and upkeep,   and $14,000 has been budgeted for these annual expenses. She wants to know how much to invest in   condominiums and land to maximize her annual return.       A) Formulate a mixed integer programming model for this problem   B) Solve this model by using a computer