Using only equations no excel please

Financial Institutions & Markets A 20-year, 10% coupon bond is currently quoted at $850. Calculate the following; Yield to maturity. Yield to call, if the bond is called 10 years later at a call price equal to par plus two years' interest. Holding period yield, if the bond is sold 5 years later at $1200. How will your answers to sections a through c in problem 1 be affected, if both Interest income and capital gains are subject to the same tax rate of 30 percent