18E-0340.0000000.2363636E-02FOUND0.0000000.2983636E-01由LINGO求解得到最优解为a1=2.40,a2=0,a3=8.10,a4=0,a5=0.50,最优值为z=0.3007.所以,分别在A、C、E上投资2.40百万元,8.10百万元,0.50百万元,最大税后收益为0.3007百万元,大于先前所得0.298百万元。所以经理应该借贷。(3)、在Lingo软件中运行Ranges选项得Rangesinwhichthebasisisunchanged:ObjectiveCoefficientRanges:CurrentAllowableAllowableVariableCoefficientIncreaseDecreaseA10.4300000E-010.3500000E-020.1300000E-01A20.2700000E-010.3018182E-01INFINITYA30.2500000E-010.1733333E-010.5600000E-03A40.2200000E-010.6363636E-03INFINITYA50.4500000E-010.5200000E-010.1400000E-01RighthandSideRanges:CurrentAllowableAllowableRowRHSIncreaseDecreaseRULE4.0000003.363636INFINITYLIMIT0.000000105.714320.0000040.00000010.0000012.00000FOUND10.00000INFINITY4.567901?由运行结果可知,A的税前收益可增加0.35%,所以A的税前收益增加为4.5%时,投资不应该变;C的税前收益可减少0.112%,所以说C的税前收益减少为4.8%时,投资应该改变。
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