re$-$write the following sentences:

Estimating bad debts functions as a required accounting estimate because it enables companies to show receivables at their net realizable value, but subjectivity makes it vulnerable to income manipulation when controls and governance are weak. This explanation will show why the practice is not manipulation and how companies maintain accurate estimates and testing methods to verify the reasonableness of noncollectible receivables.

Businesses must estimate bad debts because some customers fail to pay their bills.