You purchased a zero-coupon bond one year ago for $176.38. The market interest rate is now 9 percent.

Required: If the bond had 20 years to maturity when you originally purchased it,what was your total return for the past year? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.g., 32.16).)

Total Return for the Past Year = ?

btw I kept getting 10.27% but it is not the right answer.