Answer:
withdraw each month is $6,902.37
Explanation:
given data 
time = 25 year 
invest = $700 per month 
stock amount = $300 per month 
expected rate = 9% =  
 
bond account = 5%
return =  6% 
to find out
withdraw each month from account for 20 year withdrawal period
solution
we will apply here future value formula that is 
FV =  ...............1
      ...............1
here P is principal amount i.e $700 given and r is are and t is time 
so
The value of the stock account at retirement will be 
value of the stock account =   
   
value of the stock account = $784,785.36
and
value of the bond account at retirement will be 
value of the bond account =   
   
value of the bond account = $178,652.91
and
so  value of the two accounts combined is here 
= $178,652.91+$784,785.36    = $963,438.27
so 
monthly withdrawal from combined account is 
amount =  ...............2
      ...............2
amount =  
  
amount =  $6,902.37