Four years ago Messy House Painting issued a 20-year bond with a $1,000 maturity value and a 4 percent coupon rate of interest. Interest is paid semiannually. The bond is currently selling for $714. (a) What is the bonds yield to maturity? (b) If the bond can be called in three years for a redemption price of $1,016, what is the bonds yield to call?

( Please do not use Excel Spread sheet and do a step by step of the problem using proper formulas, I know that the answer to YTM should be around 7% and YTC around 17%. I just do not understand how to get those numbers based on the notes I have taken in class. A little help would be appreciated! )