How to understand this question? Thank you~

One year ago, your uncle purchased a bond with a par value of $1,000 and an annual coupon rate of 10%. At the time of purchase, the bond had a maturity of five years and its yield to maturity was 12%. Assume that the coupons are paid semi-annually. Today (exactly one year after the purchase), your uncle sold the bond for $1,150. During the year that he held the bond, the market interest rate declined and your uncle earned only 8% per annum on his coupon investments. U I What is the realised yield earned by your uncle from this investment