21. (3 points) Heather uses an allowance method for bad debts. During her first year of operations, Heather recorded (1) $50,000 of estimated bad debts expense, (2) $3,000 of write-offs, and (3) S50 of subsequent collections of ARs previously written off. a. Prepare the entries for the three events that Heather recorded. b. As of year-end, what was the balance in Heather's allowance for doubtful accounts