I really need help with these problems

(Bond valuation relationships) A bond of Visador Corporation pays $80 in annual interest, with a $1,000 par value. The bonds mature in 24 years The market's required yield to maturity on a comparable-risk bond is 7.5 percent. a. Calculate the value of the bond. b. How does the value change if the market's required yield to maturity on a comparable-risk bond (i) increases to 12 percent or (ii) de creases to 4 percent? c. Interpret your finding in parts a and b a. What is the value of the bond if the market's required yield to maturity on a comparable-fisk bond is 7.5 percent? (Round to the nearest cent.) b. (i) What is the value of the bond if the markef's required yield to maturity on a comparable-risk bond increases to 12 percent? I (Round to the nearest cent) b. (ii) What is the value of the bond if the market's required yleld to maturity on a comparable-risk bond decreases to 4 percent? (Round to the nearest cent.) c. The change in the value of a bond caused by changing interest rates is called interest-rate risk. Based on the answers in part b, a decrease in interest rates (the yield to maturify) will cause the value of a bond to by contrast, an increase in interest raten will cause the value to (Select from the drop-down menus) Also, based on the answers in part b, if the yleld to maturity (current interest rate) equals the coupon interest rate, the bond will sell at exceeds the bond's coupon rate the bond will sell at and is less than the bond's coupon rate, the bond will sell at (Select from the drop-down menus.)