what is the yield to maturity (YTM) on a 10-year, 9 percent annual coupon, $1000 par value bond that sells for $887.00?

what is the yield to maturity (YTM) on a 10-year, 9 percent annual coupon, $1000 par value bond that sells for $887.00? How about it sells for $1,134.20. What does the fact that a bond sells at a discount or at a premium tell you about the relationship between investors' YTM and the bond's coupon rate?