please i need all process with calculus :(

5T6-1 Bond valuation Lahey Industries has outstanding a $1,000 par-value bond with an 8% coupon rate. The bond has 12 years remaining to its maturity date. a. If interest is paid annually, find the value of the bond when the required return is (1) 7%,(2)8%, and (3) 10%. b. Indicate for each case in part a whether the bond is selling at a discount, at a premium, or at its par value. c. Using the 10% required return, find the bond's value when interest is paid semiannually