Problem:
Company A issued zero coupon bonds 5 years ago at a price of $200 per bond. The bond has a par value of $1000 and a 20 year maturity when they were isued. The bonds were callable 10 years after the issue date at a price 7 percent over their accrued value on the call date. If the bonds sell for $225 in the market today what is the annual rate of return?