a. Dmitri would earn $50 in interest in the first year (5% of $1,000). The yield would be 5%, calculated as $50 interest divided by $1,000 price.
b. If Dmitri paid $950 for the bond, he would still earn $50 in interest in the first year (5% of $1,000), but his yield would increase to 5.26%, calculated as $50 interest divided by $950 price. If he paid $1,050 for the bond, he would also earn $50 in interest in the first year (5% of $1,000), but his yield would decrease to 4.76%, calculated as $50 interest divided by $1,050 price.