Larson deposits money into a fund. For the first four years the fund ac- cumulates at a nominal interest rate of 6% convertible quarterly. For the next six years the fund accumulates at a nominal rate of discount of 8% convertible semi-annually. For the 10-year period what is the equivalent force of interest? (A) 0.0719 (B) 0.0728 (C) 0.0731 (D) 0.0737 (E) 0.0742