help please.

You purchased a zero-coupon bond one year ago for $284.46. The market interest rate is now 5.1 percent. If the bond had 25 years to maturity when you originally purchased it, what was your total return for the past year? Assume semiannual compounding Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16