Journal entries

The balance sheet of Martinez Company at December 31, 2016, includes the following.

Notes receivable		$37,800
Accounts receivable		189,600
Less: Allowance for doubtful accounts		20,400		$207,000

Transactions in 2017 include the following.

1.		Accounts receivable of $140,500 were collected including accounts of $65,800 on which 3% sales discounts were allowed.
2.		$5,500 was received in payment of an account which was written off the books as worthless in 2016.
3.		Customer accounts of $20,600 were written off during the year.
4.		At year-end, Allowance for Doubtful Accounts was estimated to need a balance of $23,100. This estimate is based on an analysis of aged accounts receivable.

Prepare all journal entries necessary to reflect the transactions above.