Answer:
The Journal entry and their narrations is shown below:-
Step-by-step explanation:
1. Allowance for doubtful accounts Dr, $9,800 
 To Account receivable-Oakley Co. $2,400 
 To Account receivable-Brookes Co. $7,400 
(Being write off is recorded) 
2. Account receivable-Oakley Co. Dr, $2,400 
 To Allowance for doubtful accounts $2,400 
(Being amount reinstated is recorded) 
3. Cash Dr, $2,400 
 To Account receivable-Oakley Co. $2,400 
(Being cash received is recorded)