Time Value of Money-The Basics 21. (Related to Checkpoint 6) (Solving for i) Springfield Learning sold zero-co bonds (bonds that don't pay any interest-instead the bondholder gets just o ment, coming when the bond matures, from the issuer) and received $900 bond that will pay $20,000 when it matures in 30 years. a. At what rate is Springfield Learning borrowing the money from investors? b. If Nancy Muntz purchased a bond at the offering for S900 and sold it 10 years ne for each later for the market price of $3.,500, what annual rate of return did she earn? it 20 years until maturity, what annual rate of return w c. If Barney Gumble purchased Muntz's bond at the market price of $3,500 and held ould he have earned