Please explain number 16 and why answer is D

A 12 percent coupon bond selling for $1,000 A 12 percent coupon bond selling for $1,100 HA 16) What is the return on a 5 percent coupon bond that initilly sells for $1,000 and sells for S1,200 next year? A) 5 percent B) 10 percent 9 5 percent D) 25 percent 17) An equal decrease in all bond interest rates A) increases the price of a five-year bond more than the price of a ten-year bond