21. An investment of $50,000 resulted in uniform income of $10,000 per year for 10 years and a single amount of $5000 in year 5. The rate of return on the investment was closest to: A. 10.6% per yr B. 14.2% per yr . 16.4% per yr D. 18.6% per yr 22. A S10,000 municipal bond due in 10 yrs pays interest of $400 per yr. If an investor purchases the bond now for $9000 and holds it to maturity, the rate of return received by the investor will be closest to: A. 6.9% B. 5.3% C. 4.2% D. 3.5% C. 24. If compounding is semiannual, find the effective annual interest rate that will make a present single payment of $5,000 equivalent to semiannual payments of $600 over 6 years. A. 12.00% B. 12.20% C. 12.57% D. 12.40%