E6-18 (Least Costly Payoff) Assume that Sonic Foundry Corporation has a contractual debt outstanding. Sonic has available two means of settlement: It can either make immediate payment of $3,500,000, or it can make annual payments of $400,000 for 15 years, each payment due on the last day of the year. Instructions Which method of payment do you recommend, assuming an expected effective interest rate of 8% during the future period