(Vacation Time). A vacation agent is booking beach house units for two month and three month leases during the winter. Let x be the number of bookings for January- February, let y be the FebruaryMarch bookings and z be the January-March bookings. The agent wants to reserve at least 25 units in January, 12 in February and 20 in March. Two month bookings cost $2400 and three month bookings go for $3000. Formulate this as a minimization linear programming problem and solve using the dual simplex method.