What is the par value of a bond that paid a $50 coupon payment last year, it has 16 years to maturity, the required rate of return is 10%, andthe current market value is $680?

Findthe coupon rateof a bond with a face value of $1,000, that matures in 8 years. Investors required rate of return is 15%, and the bond for a similar industry is traded in the marketat $942.

PLZ SHOW HOW YOU GET THE LETTER OUT OF THE FORMULA (I FOR THE SECOND QUESTION AND M FOR THE FIRST ONE)