1. What is the value of a $1,000 par value bond with annual payments of a(n)

a. 10% coupon with a maturity of 10 years and a 15% required return?

b. 8% coupon with a maturity of 10 years and a 8% required return?

c. 11% semiannual coupon with a maturity of 20 years and a 11% required return?

d. 8% semiannual coupon with a maturity of 20 years and a 9% required return?

2. What is the yield to maturity of a $1000 par value bond with a(n)

a. 10% annual coupon and 10 years to maturity and a $1,000 price?

b. 9.5% annual coupon and 20 years to maturity and a $788 price?

c. 5.0% annual coupon and 8 years to maturity and a $800 price?

Can I please get the answer with the formula so I can better understand? Thank you.