【正确答案:A】
税后经营净利润=税前经营利润× (1-25%) = 600 × ( 1 - 25%) =450 (万元);
净经营资产净利率=税后经营净利润/净经营资产=450/1200 =37. 5%;
净负债=净经营资产-股东权益=1200 - 400 = 800 (万元);
净财务杠杆=净负债/股东权益=800/400 =2;
税后利息率=40 × (1 -25%) /800 = 3. 75% ;
杠杆贡献率=(净经营资产净利率-税后利息率)×净财务杠杆=(37.5% -3.75% ) ×2 = 67.50%。



