please solve all four in financial calculator way and terms

What is the yield to call (YTC) of a 30 year 8% bond selling for $940 ? The call deferment period for the bond is 10 years. What is the yield to call (YTC) of a 20 year 9% bond selling for $1030 ? The call deferment period for the bond is 5 years. What is the holding period yield on a 30 year 7% bond that we buy for $1020. We sell the bond in 4 years for $1040. Suppose you bought a 10 year 8% bond for $975. If you sold the bond for $940 after holding it for 2 years, what was your holding period yield