For Bonds a and B Below Find the Values of X

For bonds A and B below find the values of X and Y assuming each is a zero coupon bond with a $1,000 face value (semiannual compounding) .

A) 8 years and 4 percent
B) 10 years and 8 percent
C) 12 years and 10 percent
D) 14 years and 12 percent
E) 8 years and 18 percent