Your employer has given you the following task: He wants to know how much he has to invest now to have $10,000 for a new piece of machinery he wants to purchase in 5 years. The bank has quoted him an interest rate of 8% compounded daily. On March 3, when the posted prime rate was 4%, an investment of $10,000 was placed into an account, earning prime + 22%. Effective June 26, the prime rate rose by 34%, and on October 4 it rose another 12%. On November 2, it declined by 14%. If the money was withdrawn on December 15, how much simple interest did it earn?