Answer:
Keep the cattle and recover the contract price from Esau
Explanation:
Since in the question it is given that the Double D Ranch and Esau enter into a contract on August 1 for selling of 200 cattle. 
But Esau cancels the contract after 10 days. Now the Double D Ranch is not able to sell the cattle to the another buyer so in this case , the Double D Ranch should keep the cattle and get back the price of the contract from the another party i.e Esau as he cancels the contract
 
        
             
        
        
        
Answer:Yield to maturity is 9.59%;  After tax cost of debt =7.672%
Explanation:
  A)   Yield to maturity ={ C + (FV-PV)/t} /  {(FV +PV)/2}
 Where C – Interest payment    = $90
FV – Face value of the security
= $1000
PV – Present value/curent market value = $960
t – years it takes the security to reach maturity= 10 years
 imputing the values and calculating, 
 yield to maturity ={ C + (FV-PV)/t} /  {(FV +PV)/2}
= $90 + (1000-960)/10} / 1000 + 960 /2
$90 + 4= $94 /980= 0.0959 
therefore Yield to maturity is 9.59%
B)   After tax cost of debt =    Yield To Maturity  x (1 - tax rate)
=9.59% x (1-20%)= 9.59% x (1-0.2 )= 9.59% x 0.8 =
 9.59 % x 80%=7.672%