Answer:
$9,400
Explanation:
 
 Account receivable,%Uncollectible,Estimated Bad debt
 
 A B C
0–30 $77,000 × 1% = $770
 31–60 $46,000 ×4%=$ 1,840
 61–90 $39,000 × 5%=$ 1,950
 91–120 $23,000 ×8%=$1,840
Over 120 $15,000 ×20%= $3,000 
 TOTAL $200,000=$ 9,400
The total estimated bad debts based on the information given is $9,400
Note:
Account receivable is A
 % Uncollectible is B
Estimated Bad debt is C
Estimated bad debt is A× percentage of B= C