You purchased a bond last year that pays an 8% annual coupon with a face value of $1,000. At the time of purchase, the bond had a yield to maturity of 10% and had 10 years until maturity. Today, the bond trades at a yield to maturity of 9%. What was the dollar return of this investment over the last year?

The answer is $143.

Please provide step-by-step calculation with detailed explanation. Don't forget explantiaon, which helps me understand the calcualtion! Thanks.