Hi, I am currently studying for my upcoming corporate finance exam, I hope that you can help me with this small question. Thank you in advance!

You purchased a zero coupon bond one year ago for $175.10. The bond has a par value of $1,000 and the market interest rate is now 12 percent. If the bond had 15 years to maturity when you originally purchased it, what was your total return for the past year? Assume semiannual compounding.