I need help to determine what formula to use to answer this question... 2.Midland Oil has $1,000 par value bonds outstanding at 8 percent interest. The bonds will mature in 25 years. Compute the...

I need help to determine what formula to use to answer this question...

2.Midland Oil has $1,000 par value bonds outstanding at 8 percent interest. The bonds will mature in 25 years. Compute the current price of the bonds if the present yield to maturity is
a.7 percent.
b.10 percent.
c.13 percent.